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 number of hours of television watched per day for last year.

a. Find a 90% confidence interval for the amount of television watched per day last year by the average person. x = 4.760 hr and s = 2.297 hr.
b. Interpret your answer from part (a).

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