Determine the first, second, and third quartiles for the data in Exercise 3.20; then calculate the interquartile range and the quartile deviation.

Exercise 3.20

For a sample of 11 employers, the most recent hourly wage increases were 18, 30, 25, 5, 7, 2, 20, 12, 15, 55, and 40 cents per hour. For these sample data, determine: a. The mean, median, range, and midrange. b. The mean absolute deviation. c. The standard deviation and variance. 3.21 According to the U.S. Environmental Protection Agency, a sample of 10 subcompact models shows the following estimated values for highway fuel economy (mpg): 40, 33, 32, 30, 27, 29, 27, 23, 21, and 10. For these sample data, determine:

a. The mean, median, range, and midrange.

b. The mean absolute deviation.

c. The standard deviation and variance.