chap03-TIF-BSAFC5
CHAPTER 3: NUMERICAL DESCRIPTIVE MEASURES
1.Which of the following statistics is not a measure of central tendency?
a)Arithmetic mean.
b)Median.
c)Mode.
d)Q3.
ANSWER:
d
TYPE: MC DIFFICULTY: Easy
KEYWORDS: measure of central tendency, arithmetic mean, median, mode, quartiles
2.Which measure of central tendency can be used for both numerical and categorical variables?
a)Arithmetic mean.
b)Median.
c)Mode.
d)Standard deviation.
ANSWER:
c
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: measure of central tendency, mode, arithmetic mean, median
3.Which of the arithmetic mean, median, and mode are resistant measures of central tendency?
a)The arithmetic mean and median only.
b)The median and mode only.
c)The mode and arithmetic mean only.
d)All the three are resistant measures.
ANSWER:
b
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: measure of central tendency, resistant to outliers, mean, median, mode
4.In a right-skewed distribution
a)the median equals the arithmetic mean.
b)the median is less than the arithmetic mean.
c)the median is larger than the arithmetic mean.
d)none of the above.
ANSWER:
b
TYPE: MC DIFFICULTY: Easy
KEYWORDS: shape
5.Which of the following statements about the median is not true?
a)It is more affected by extreme values than the arithmetic mean.
b)It is a measure of central tendency.
c)It is equal to Q2.
d)It is equal to the mode in bell-shaped "normal" distributions.
ANSWER:
a
TYPE: MC DIFFICULTY: Easy
KEYWORDS: median, measure of central tendency, resistant to outliers, quartile
6.In a perfectly symmetrical bell-shaped "normal" distribution
a)the arithmetic mean equals the median.
b)the median equals the mode.
c)the arithmetic mean equals the mode.
d)All the above.
ANSWER:
d
TYPE: MC DIFFICULTY: Easy
KEYWORDS: shape, normal distribution
7.In a perfectly symmetrical distribution
a)the range equals the interquartile range.
b)the interquartile range equals the arithmetic mean.
c)the median equals the arithmetic mean.
d)the variance equals the standard deviation.
ANSWER:
c
TYPE: MC DIFFICULTY: Easy
KEYWORDS: shape
8.When extreme values are present in a set of data, which of the following descriptive summary
measures are most appropriate:
a)CV and range.
b)arithmetic mean and standard deviation.
c)interquartile range and median.
d)variance and interquartile range.
ANSWER:
c
TYPE: MC DIFFICULTY: Easy
KEYWORDS: resistant to outliers, coefficient of variation, range, arithmetic mean, standard deviation, interquartile range, median, variance
9.In general, which of the following descriptive summary measures cannot be easily approximated
from a boxplot?
a)The variance.
b)The range.
c)The interquartile range.
d)The median.
ANSWER:
a
TYPE: MC DIFFICULTY: Easy
KEYWORDS: boxplot, variance, range, interquartile range, median
10.The smaller the spread of scores around the arithmetic mean,
a)the smaller the interquartile range.
b)the smaller the standard deviation.
c)the smaller the coefficient of variation.
d)All the above.
ANSWER:
d
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: variation, arithmetic mean, interquartile range, standard deviation, coefficient of variation
11.Which descriptive summary measures are considered to be resistant statistics?
a)The arithmetic mean and standard deviation.
b)The interquartile range and range.
c)The mode and variance.
d)The median and interquartile range.
ANSWER:
d
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: resistant to outliers, arithmetic mean, standard deviation, interquartile range, range, mode, variance, median
12.In right-skewed distributions, which of the following is the correct statement?
a)The distance from Q1 to Q2 is larger than the distance from Q2 to Q3.
b)The distance from Q1 to Q2 is smaller than the distance from Q2 to Q3.
c)The arithmetic mean is smaller than the median.
d)The mode is larger than the arithmetic mean.
ANSWER:
b
TYPE: MC DIFFICULTY: Easy
KEYWORDS: shape, quartiles, arithmetic mean, mode
13.In perfectly symmetrical distributions, which of the following is NOT a correct statement?
a)The distance from Q1 to Q2 equals to the distance from Q2 to Q3.
b)The distance from the smallest observation to Q1 is the same as the distance from Q3 to
the largest observation.
c)The distance from the smallest observation to Q2 is the same as the distance from Q2 to
the largest observation.
d)The distance from Q1 to Q3 is half of the distance from the smallest to the largest
observation.
ANSWER:
d
TYPE: MC DIFFICULTY: Easy
KEYWORDS: shape, quartiles, five-number summary, quartiles
14.In left-skewed distributions, which of the following is the correct statement?
a)The distance from Q1 to Q2 is smaller than the distance from Q2 to Q3.
b)The distance from the smallest observation to Q1 is larger than the distance from Q3 to
the largest observation.
c)The distance from the smallest observation to Q2 is smaller than the distance from Q2 to
the largest observation.
d)The distance from Q1 to Q3 is twice the distance from the Q1 to Q2.
ANSWER:
b
TYPE: MC DIFFICULTY: Easy
KEYWORDS: shape, quartiles, five-number summary, quartiles
15.According to the empirical rule, if the data form a "bell-shaped" normal distribution, _______
percent of the observations will be contained within 2 standard deviations around the arithmetic mean.
a)68.26
b)88.89
c)93.75
d)95.44
ANSWER:
d
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: empirical rule, normal distribution
16.According to the empirical rule, if the data form a "bell-shaped" normal distribution, _______
percent of the observations will be contained within 1 standard deviation around the arithmetic mean.
a)68.26
b)75.00
c)88.89
d)93.75
ANSWER:
a
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: empirical rule, normal distribution
17.According to the empirical rule, if the data form a "bell-shaped" normal distribution, _______
percent of the observations will be contained within 3 standard deviations around the arithmetic mean.
a)68.26
b)75.00
c)95.0
d)99.7
ANSWER:
d
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: empirical rule, normal distribution
18.Which of the following is NOT a measure of central tendency?
a)The arithmetic mean.
b)The median.
c)The mode.
d)The interquartile range.
ANSWER:
d
TYPE: MC DIFFICULTY: Easy
KEYWORDS: measure of central tendency, arithmetic mean, median, mode, interquartile range
19.Which of the following is NOT sensitive to extreme values?
a)The range.
b)The standard deviation.
c)The interquartile range.
d)The coefficient of variation.
ANSWER:
c
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: resistant to outliers, range, standard deviation, interquartile range, coefficient of variation
20.Which of the following is sensitive to extreme values?
a)The median.
b)The interquartile range.
c)The arithmetic mean.
d)The 1st quartile.
ANSWER:
c
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: resistant to outliers, median, interquartile range, arithmetic mean, quartiles
21.Which of the following is the easiest to compute?
a)The arithmetic mean.
b)The median.
c)The mode.
d)The standard deviation.
ANSWER:
c
TYPE: MC DIFFICULTY: Easy
KEYWORDS: mode, arithmetic mean, median
22.According to the Chebyshev rule, at least 75% of all observations in any data set are contained
within a distance of how many standard deviations around the mean?
a) 1
b) 2
c) 3
d) 4
ANSWER:
b
TYPE: MC DIFFICULTY: Easy
KEYWORDS: Chebyshev rule
23.According to the Chebyshev rule, at least 93.75% of all observations in any data set are
contained within a distance of how many standard deviations around the mean?
a) 1
b) 2
c) 3
d) 4
ANSWER:
d
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: Chebyshev rule
24.According to the Chebyshev rule, at least what percentage of the observations in any data set are
contained within a distance of 3 standard deviations around the mean?
a)67%
b)75%
c)88.89%
d)99.7%
ANSWER:
c
TYPE: MC DIFFICULTY: Easy
KEYWORDS: Chebyshev rule
25.According to the Chebyshev rule, at least what percentage of the observations in any data set are
contained within a distance of 2 standard deviations around the mean?
a)67%
b)75%
c)88.89%
d)95%
ANSWER:
b
TYPE: MC DIFFICULTY: Easy
KEYWORDS: Chebyshev rule
TABLE 3-1
Health care issues are receiving much attention in both academic and political arenas. A sociologist recently conducted a survey of citizens over 60 years of age whose net worth is too high to qualify for Medicaid and have no private health insurance. The ages of 25 uninsured senior citizens were as follows:
60 61 62 63 64 65 66 68 68 69 70 73 73
74 75 76 76 81 81 82 86 87 89 90 92
26.Referring to Table 3-1, calculate the arithmetic mean age of the uninsured senior citizens to the
nearest hundredth of a year.
ANSWER:
74.04 years
TYPE: PR DIFFICULTY: Easy
KEYWORDS: arithmetic mean
27.Referring to Table 3-1, identify the median age of the uninsured senior citizens.
ANSWER:
73 years
TYPE: PR DIFFICULTY: Easy
KEYWORDS: median
28.Referring to Table 3-1, identify the first quartile of the ages of the uninsured senior citizens. ANSWER:
65.5 years
TYPE: PR DIFFICULTY: Moderate
KEYWORDS: quartiles
29.Referring to Table 3-1, identify the third quartile of the ages of the uninsured senior citizens. ANSWER:
81.5 years
TYPE: PR DIFFICULTY: Moderate
KEYWORDS: quartiles
30.Referring to Table 3-1, identify the interquartile range of the ages of the uninsured senior citizens. ANSWER:
16 years
TYPE: PR DIFFICULTY: Moderate
KEYWORDS: interquartile range
31.Referring to Table 3-1, identify which of the following is the correct statement.
a)One fourth of the senior citizens sampled are below 65.5 years of age.
b)The middle 50% of the senior citizens sampled are between 65.5 and 73.0 years of age.
c)The average age of senior citizens sampled is 73.5 years of age.
d)All of the above are correct.
ANSWER:
a
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: quartiles, arithmetic mean
32.Referring to Table 3-1, identify which of the following is the correct statement.
a)One fourth of the senior citizens sampled are below 64 years of age.
b)The middle 50% of the senior citizens sampled are between 65.5 and 73.0 years of age.
c)25% of the senior citizens sampled are older than 81.5 years of age.
d)All of the above are correct.
ANSWER:
c
TYPE: MC DIFFICULTY: Moderate
KEYWORDS: quartiles
33.Referring to Table 3-1, what type of shape does the distribution of the sample appear to have? ANSWER:
Slightly positive or right-skewed.
TYPE: PR DIFFICULTY: Moderate
KEYWORDS: shape
34.Referring to Table 3-1, calculate the variance of the ages of the uninsured senior citizens correct
to the nearest hundredth of a year squared.
ANSWER:
94.96 years2
TYPE: PR DIFFICULTY: Moderate
KEYWORDS: variance
35.Referring to Table 3-1, calculate the standard deviation of the ages of the uninsured senior
citizens correct to the nearest hundredth of a year.
ANSWER:
9.74 years
TYPE: PR DIFFICULTY: Moderate
KEYWORDS: standard deviation
36.Referring to Table 3-1, calculate the coefficient of variation of the ages of the uninsured senior
citizens.
ANSWER:
13.16%
TYPE: PR DIFFICULTY: Moderate
KEYWORDS: coefficient of variation
37.True or False: The median of the values 3.4, 4.7, 1.9, 7.6, and 6.5 is 1.9.
ANSWER:
False
TYPE: TF DIFFICULTY: Moderate
KEYWORDS: median
38.True or False: The median of the values 3.4, 4.7, 1.9, 7.6, and 6.5 is 4.05.
ANSWER:
False
TYPE: TF DIFFICULTY: Moderate
KEYWORDS: median
39.True or False: In a set of numerical data, the value for Q3 can never be smaller than the value for
Q1.
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: quartiles
40.True or False: In a set of numerical data, the value for Q2 is always halfway between Q1 and Q3. ANSWER:
False
TYPE: TF DIFFICULTY: Easy
KEYWORDS: quartiles
41.True or False: If the distribution of a data set were perfectly symmetrical, the distance from Q1 to
the median would always equal the distance from Q3 to the median in a boxplot.
ANSWER:
True
TYPE: TF DIFFICULTY: Moderate
KEYWORDS: boxplot, quartiles, shape
42.True or False: In right-skewed distributions, the distance from Q3 to the largest observation
exceeds the distance from the smallest observation to Q1.
ANSWER:
True
TYPE: TF DIFFICULTY: Moderate
KEYWORDS: quartiles, shape
43.True or False: In left-skewed distributions, the distance from the smallest observation to Q1
exceeds the distance from Q3 to the largest observation.
ANSWER:
True
TYPE: TF DIFFICULTY: Moderate
KEYWORDS: quartiles, shape
44.True or False: A boxplot is a graphical representation of a 5-number summary.
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: boxplot, five-number summary
45.True or False: The 5-number summary consists of the smallest observation, the first quartile, the
median, the third quartile, and the largest observation.
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: five-number summary
46.True or False: In a boxplot, the box portion represents the data between the first and third
quartile values.
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: boxplot
47.True or False: The line drawn within the box of the boxplot always represents the arithmetic
mean.
ANSWER:
False
TYPE: TF DIFFICULTY: Easy
KEYWORDS: boxplot, arithmetic mean
48.True or False: The line drawn within the box of the boxplot always represents the median. ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: boxplot, median
49.True or False: In a sample of size 40, the sample mean is 15. In this case, the sum of all
= 600.
observations in the sample is X
i
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: arithmetic mean
50.True or False: A population with 200 elements has an arithmetic mean of 10. From this
information, it can be shown that the population standard deviation is 15.
ANSWER:
False
TYPE: TF DIFFICULTY: Easy
KEYWORDS: arithmetic mean, standard deviation
51.True or False: In exploratory data analysis, a boxplot can be used to illustrate the median,
quartiles, and extreme values.
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: boxplot, five-number summary
52.True or False: An economics professor bases his final grade on homework, two midterm
examinations, and a final examination. The homework counts 10% toward the final grade, while each midterm examination counts 25%. The remaining portion consists of the final examination.
If a student scored 95% in homework, 70% on the first midterm examination, 96% on the second midterm examination, and 72% on the final, his final average is 79.8%.
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: arithmetic mean
53.True or False: The median of a data set with 20 items would be the average of the 10th and the
11th items in the ordered array.
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: median, arithmetic mean
54.True or False: The coefficient of variation measures variability in a data set relative to the size of
the arithmetic mean.
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: coefficient of variation
55.True or False: The coefficient of variation is expressed as a percentage.
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: coefficient of variation
56.True or False: The coefficient of variation is a measure of central tendency in the data. ANSWER:
False
TYPE: TF DIFFICULTY: Easy
KEYWORDS: coefficient of variation, measure of variation
57.True or False: The interquartile range is a measure of variation or dispersion in a set of data. ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: interquartile range, measure of variation
58.True or False: The interquartile range is a measure of central tendency in a set of data. ANSWER:
False
TYPE: TF DIFFICULTY: Easy
KEYWORDS: interquartile range, measure of variation
59.True or False: If a set of data is perfectly symmetrical, the arithmetic mean must be identical to
the median.
ANSWER:
True
TYPE: TF DIFFICULTY: Easy
KEYWORDS: shape, arithmetic mean, median
60.True or False: The coefficient of variation is a measure of relative variation.
ANSWER:
True
TYPE: TF DIFFICULTY: Moderate
KEYWORDS: coefficient of variation
61.True or False: If the data set is approximately bell-shaped, the empirical rule will more
accurately reflect the greater concentration of data close to the mean as compared to the
Chebyshev rule.
ANSWER:
True
TYPE: TF DIFFICULTY: Moderate
KEYWORDS: empirical rule, Chebyshev rule, normal distribution
62.If the arithmetic mean of a numerical data set exceeds the median, the data are considered to be
_______ skewed.
ANSWER:
positive or right
TYPE: FI DIFFICULTY: Easy
KEYWORDS: shape, arithmetic mean, median
TABLE 3-2
The data below represent the amount of grams of carbohydrates in a serving of breakfast cereal in a sample of 11 different servings.
11 15 23 29 19 22 21 20 15 25 17
63.Referring to Table 3-2, the arithmetic mean carbohydrates in this sample is ________ grams. ANSWER:
217/11 = 19.73
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: arithmetic mean
64.Referring to Table 3-2, the median carbohydrate amount in the cereal is ________ grams. ANSWER:
20
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: median
65.Referring to Table 3-2, the first quartile of the carbohydrate amounts is ________ grams. ANSWER:
15
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: quartiles
66.Referring to Table 3-2, the third quartile of the carbohydrate amounts is ________ grams. ANSWER:
23
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: quartiles
67.Referring to Table 3-2, the range in the carbohydrate amounts is ________ grams. ANSWER:
18
TYPE: FI DIFFICULTY: Easy
KEYWORDS: range
68.Referring to Table 3-2, the interquartile range in the carbohydrate amounts is ________ grams. ANSWER:
8
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: interquartile range
69.Referring to Table 3-2, the variance of the carbohydrate amounts is ________ (grams squared). ANSWER:
26.02
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: variance
70.Referring to Table 3-2, the standard deviation of the carbohydrate amounts is ________ grams. ANSWER:
5.10
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: standard deviation
71.Referring to Table 3-2, the coefficient of variation of the carbohydrate amounts is ________
percent.
ANSWER:
25.86%
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: coefficient of variation
72.Referring to Table 3-2, the five-number summary of the carbohydrate amounts consists of
________, ________, ________, ________, ________.
ANSWER:
11, 15, 20, 23, 29
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: five-number summary
73.Referring to Table 3-2, construct a boxplot for the carbohydrate amounts.
Box-and-whisker Plot
1015202530
ANSWER:
TYPE: PR DIFFICULTY: Moderate
KEYWORDS: boxplot
74.Referring to Table 3-2, what type of shape does the distribution of the sample appear to have? ANSWER:
Slightly positive or right-skewed.
TYPE: PR DIFFICULTY: Moderate
EXPLANATION: The distribution is considered as slightly right-skewed because the length of the right whisker (6) is slighter longer than the length of the left whisker (4). The distribution could also be considered as slight left-skewed since the mean (19.73) is slightly lower than the median (20). KEYWORDS: shape
TABLE 3-3
The stem-and-leaf display below represents the number of vitamin supplements sold by a health food store in a sample of 16 days.
Stem Leaves
2L 0023
2H 567
3L 034
3H 568
4L 1
Note (1): 1H means the “high teens” –15, 16, 17, 18, or 19; 2L means the “low twenties” – 20, 21, 22, 23, or 24; 2H means the “high twenties” – 25, 26, 27, 28, or 29, etc.
Note (2): For this sample, the sum of the observations is 448, the sum of the squares of the observations is 13,356, and the sum of the squared differences between each observation and the mean is 812.
75.Referring to Table 3-3, the arithmetic mean of the number of vitamin supplements sold in this
sample is ________.
ANSWER:
28
TYPE: FI DIFFICULTY: Easy
KEYWORDS: arithmetic mean
76.Referring to Table 3-3, the first quartile of the number of vitamin supplements sold in this
sample is ________.
ANSWER:
20
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: quartiles
77.Referring to Table 3-3, the third quartile of the number of vitamin supplements sold in this
sample is ________.
ANSWER:
35
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: quartiles
78.Referring to Table 3-3, the median number of vitamin supplements sold in this sample is
________.
ANSWER:
26.5
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: median
79. Referring to Table 3-3, the range of the number of vitamin supplements sold in this sample is
________.
ANSWER:
22
TYPE: FI DIFFICULTY: Easy
KEYWORDS: range
80.Referring to Table 3-3, the interquartile range of the number of vitamin supplements sold in this
sample is ________.
ANSWER:
15
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: interquartile range
81.Referring to Table 3-3, the variance of the number of vitamin supplements sold in this sample is
________.
ANSWER:
54.1
TYPE: FI DIFFICULTY: Easy
KEYWORDS: variance
82.Referring to Table 3-3, the standard deviation of the number of vitamin supplements sold in this
sample is ________.
ANSWER:
7.4
TYPE: FI DIFFICULTY: Easy
KEYWORDS: standard deviation
83.Referring to Table 3-3, the coefficient of variation of the number of vitamin supplements sold in
this sample is ________ percent.
ANSWER:
26.3%
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: coefficient of variation
84. Referring to Table 3-3, the five-number summary of the data in this sample consists of ________,
________, ________, ________, ________.
ANSWER:
19, 20, 26.5, 35, 41
TYPE: FI DIFFICULTY: Moderate KEYWORDS: five-number summary
85. Referring to Table 3-3, construct a boxplot for the data in this sample.
ANSWER:
TYPE: PR DIFFICULTY: Moderate KEYWORDS: boxplot
86. Referring to Table 3-3, what type of shape does the distribution of the sample appear to have?
ANSWER:
Slightly positive or right-skewed. TYPE: PR DIFFICULTY: Moderate KEYWORDS: shape
TABLE 3-4
The stem-and-leaf display below represents the number of cargo manifests approved by customs inspectors of the Port of New York in a sample of 35 days. STEM LEAVES 2L 0011122223333444 2H
5566678899
Box-and-whisker Plot
10203040
3L 1122
Note (1): 1H means the “high teens” –15, 16, 17, 18, or 19; 2L means the “low twenties” – 20, 21, 22, 23, or 24; 2H means the “high twenties” – 25, 26, 27, 28, or 29, etc.
Note (2): For this sample, the sum of the observations is 838, the sum of the squares of the observations is 20,684, and the sum of the squared differences between each observation and the mean is 619.89.
87.Referring to Table 3-4, the arithmetic mean of the customs data is ________.
ANSWER:
23.9
TYPE: FI DIFFICULTY: Easy
KEYWORDS: arithmetic mean
88.Referring to Table 3-4, the median of the customs data is ________.
ANSWER:
23
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: median
89.Referring to Table 3-4, the first quartile of the customs data is ________.
ANSWER:
21
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: quartiles
90.Referring to Table 3-4, the third quartile of the customs data is ________.
ANSWER:
27
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: quartiles
91.Referring to Table 3-4, the range of the customs data is ________.
ANSWER:
16
TYPE: FI DIFFICULTY: Easy
KEYWORDS: range
92.Referring to Table 3-4, the interquartile range of the customs data is ________.
ANSWER:
6
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: interquartile range
93.Referring to Table 3-4, the variance of the customs data is ________.
ANSWER:
18.2
TYPE: FI DIFFICULTY: Easy
KEYWORDS: variance
94.Referring to Table 3-4, the standard deviation of the customs data is ________.
ANSWER:
4.3
TYPE: FI DIFFICULTY: Easy
KEYWORDS: standard deviation
95.Referring to Table 3-4, the coefficient of variation of the customs data is ________ percent. ANSWER:
17.8% or 18%
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: coefficient of variation
96.Referring to Table 3-4, the five-number summary for the data in the customs sample consists of
________, ________, ________, ________, ________.
ANSWER:
16, 21, 23, 27, 32
TYPE: FI DIFFICULTY: Moderate
KEYWORDS: five-number summary
97.Referring to Table 3-4, construct a boxplot of this sample.
Box-and-whisker Plot
101520253035
ANSWER:
TYPE: PR DIFFICULTY: Moderate
KEYWORDS: boxplot