25. In recent years, a growing array of entertainment options competes for consumer time. By 2004, cable television and radio surpassed broadcast television, recorded music, and the daily newspaper to become the two entertainment media with the greatest usage (The Wall Street Journal, January 26, 2004). Researchers used a sample of 15 individuals and collected data on the hours per week spent watching cable television and hours per week spent listening to the radio.

Individual Television Radio Individual Television Radio 1 22 25 9 21 21 2 8 10 10 23 23 3 25 29 11 14 15 4 22 19 12 14 18 5 12 13 13 14 17 6 26 28 14 16 15 7 22 23 15 24 23 8 19 21

a. Use a .05 level of significance and test for a difference between the population mean usage for cable television and radio. What is the p-value?

b. What is the sample mean number of hours per week spent watching cable television? What is the sample mean number of hours per week spent listening to radio? Which medium has the greater usage?