1. Who seems to have more variability in their shoe sizes, men or women?

A. Men

B. Women

C. Neither group show variability

2. In general, why use the estimate of n – 1 rather than n in the computation of the standard deviation and variance?

A, The estimate n-1 is better because it is used for calculating the population variance and standard deviation

B. The estimate n-1 is never used to calculate the sample variance and standard deviation

C. n-1 provides an unbiased estimate of the population and allows more variability when using a sample and gives a better mathematical estimate of the population

D. The estimate n-1 is better because it is use for calculation of both the population and sample variance as well as standard deviation

Shoe Size (in cm) Gender (M or F) Shoe Size (in cm) Gender (M or F) 25.7 27.6 25.4 F 26.9 F F F 23.8 26 ? 25.4 F 28.4 26.7 ? F 23.5 23.8 F F 27 F F 25.4 25.1 F 25.4 28.4 25.7 ? F 23.1 F F 25.7 23.8 F F 23.5 26 F 23.1 25.4 ? 26 23.8 F 23.5 M 24.8 F 26.7 F 25.1 26 ? F 24.8 23.1 26 F F 25.1 25.4 27 26 ? 25.4 F 27 25.7 23.5 F 27 ? 23.8 ? F 27 23.5 ? 25.7 29 Data Set Total N is 60, 17 men and 31 women