A frequency distribution of standardized IQ scores for equal numbers of male and female grade-school children probably will be

a. bimodal.

b. normal.

c. positively skewed.

d. negatively skewed.

7. When constructing a graph, you must first decide on the type of graph. This decision depends on

a. the total number of observations.

b. whether data are grouped or ungrouped.

c. whether data are quantitative or qualitative.

d. the impression that you wish to create.

8. Find the median for the following observations: a. 29, 54, 43, 38, 40, 71. b. 21 c. 40.5 d. 41.5 e. 42.5 9. You're told that the shape of the distribution of burning times for light bulbs is balanced (normally distributed), with a mean burning time of about 500 hours. Therefore you can conclude that the median burning time

a. equals about 500 hours.

b. is more than 500 hours.

c. is fewer than 500 hours.

d. could be any of the above.

10. When a distribution is skewed, report

a. the median.

b. both the median and mode.

c. both the median and mean.

d. the mean.

11. The distribution of annual incomes for U.S. households is positively skewed. If the Census Bureau reports a median annual income of $47,450, this implies that the mean annual income is

a. about the same.

b. larger.

c. smaller.

d. either larger or smaller, but it's impossible to decide on the basis of the available information.