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Practice Exam
Chapter 3 - Numerical Descriptive Measures

SECTION I :M ULTIPLE -CHOICE

1. Which of the following statistics is not a measure of central tendency?

a) Arithmetic mean.

b) Median.

c) Mode.

d) Q3.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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

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