Home Chapter 3 Self-Assessment Quizzes Multiple Choice

# Multiple Choice

This activity contains 20 questions.

## Which measure of central tendency can be used for both numerical and categorical variables?

 Mean. Median. Mode. Quartiles.

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

 Mean. Median. Mode. Q3.

## Which of the following statements about the median is NOT true?

 It is more affected by extreme values than the mean. It is a measure of central tendency. It is equal to Q2. It is equal to the mode in bell-shaped distributions.

## The value in a data set that appears most frequently is called:

 the median. the mode. the mean. the variance.

## In a perfectly symmetrical distribution:

 the mean equals the median. the median equals the mode. the mean equals the mode. All the above.

## When extreme values are present in a set of data, which of the following descriptive summary measures are most appropriate?

 CV and range. Mean and standard deviation. Median and interquartile range. Mode and variance.

## The smaller the spread of scores around the mean:

 the smaller the interquartile range. the smaller the standard deviation. the smaller the coefficient of variation. All the above.

## According to the empirical rule, if the data form a "bell-shaped" normal distribution, _______ percent of the observations will be contained within two standard deviations around the mean.

 67% 75% 88.89% 90% to 95%

## In a right-skewed distribution:

 the median equals the mean. the mean is less than the median. the mean is greater than the median. the mean is less than the mode.

## Which of the following descriptive summary measures cannot be easily approximated from a box-and-whisker plot?

 The variance The range The interquartile range All the above

TABLE 3-1

The data below represents the amount of grams of carbohydrates in a serving of breakfast cereal.

 11 15 23 29 19 22 21 20 15 25 17

Referring to Table 3-1, the mean carbohydrates in this sample is ________ grams.

 15.25 19.73 21.42 21.7

## Referring to Table 3-1, the median carbohydrate amount in the cereal is ________ grams.

 19 20 21 21.5

## Referring to Table 3-1, the 1st quartile of the carbohydrate amounts is ________ grams.

 15 20 21 25

## Referring to Table 3-1, the range in the carbohydrate amounts is ________ grams.

 16 18 20 21

## Referring to Table 3-1, the variance of the carbohydrate amounts is ________ (grams squared).

 5.1 23.65 26.02 31.54

## In right-skewed distributions, which of the following is the Correct statement?

 The distance from Q1 to Q2 is larger than the distance from Q2 to Q3. The distance from Q1 to Q2 is smaller than the distance from Q2 to Q3. The mean is smaller than the median. The mode is larger than the mean.

## If the correlation coefficient is equal to 1.00, then

 all the data points must fall exactly on a straight line with a slope equals 1.00. all the data points must fall exactly on a straight line with a negative slope. all the data points must fall exactly on a straight line with a positive slope. all the data points must fall exactly on a horizontal straight line with a zero slope.

## The strength of the linear relationship between two numerical variables may be measured by the

 mean. interquartile range. coefficient of variation. coefficient of correlation.

## Which of the following is not part of the five-number summary?

 Q1 Median Q3 Mode

## In the box-and-whisker plot for a bell-shape distribution,

 the left-side whisker is longer than the right-side whisker. the left-side whisker is shorter than the right-side whisker. the left-side whisker is the same length as the right-side whisker. None of the above.