9. Why is the variance little used as a descriptive measure?

*10. Imagine that each of the following pairs of means and standard deviations was determined from scores on a 50-item test. With only this information, describe the probable shape of each distribution. (Assume a normal distribution unless you believe the information presented suggests otherwise.)

(a) X ¼ 29; S ¼ 3

(b) X ¼ 29; S ¼ 4

(c) X ¼ 48; S ¼ 4

(d) X ¼ 50; S ¼ 0 84 Chapter 5 Variability