Chapter 4.2, Problem 28E

The U.S. Department of Transportation reported the data in the accompanying table on the number of speed-related crash fatalities during holiday periods for the years from 1994 to 2003 （Traffic Safety Facts, July 20, 2005).

1. a. Calculate the standard deviation for the New Year’s Day data.
2. b. Without calculating the standard deviation of the Memorial Day data, explain whether the standard deviation for the Memorial Day data would be larger or smaller than the standard deviation of the New Year’s Day data.

Data For Exercise 4.30

1. c. Memorial Day and Labor Day are holidays that always occur on Monday and Thanksgiving always occurs on a Thursday, whereas New Year’s Day, July 4th, and Christmas do not always fall on the same day of the week every year. Based on the given data, is there more or less variability in the speed-related crash fatality numbers from year to year for same day of the week holiday periods than for holidays that can occur on different days of the week? Support your answer with appropriate measures of variability.