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 ud 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 ten
dency?
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
固然的近义词
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)昆明出国留学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)急诊出科小结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:触电应急演练方案
描写除夕的古诗
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.
紫色包菜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 prent in a t 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, standa
rd 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:
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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
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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 obrvation to Q1 is the same as the distance from Q3 t
o the largest obrvation.
c)The distance from the smallest obrvation to Q2 is the same as the distance from Q2 to the largest obrvation.
d)The distance from Q1 to Q3 is half of the distance from the smallest to the largest obrvation.
