8.94 TV Viewing. According to Communications Industry Forecast, published by Veronis Suhler Stevenson of New York, NY, the average person watched 4.55 hours of television per day

in 2005. A random sample of 20 people gave the following num- ber of hours of television watched per day for last year.

8.4 Confidence Intervals for One Population Mean When Is Unknown 351

1.0 4.6 5.4 3.7 5.2 1.7 6.1 1.9 7.6 9.1 6.9 5.5 9.0 3.9 2.5 2.4 4.7 4.1 3.7 6.2

a. Find a 90% confidence interval for the amount of televi- sion watched per day last year by the average person. (Note:

x = 4.760 hr and s = 2.297 hr.) b. Interpret your answer from part (a).