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1. A market researcher for a consumer electronics company wants to study the TV viewing habits...

1. A market researcher for a consumer electronics company wants to study the TV viewing habits of residents of a particular area. A random sample of 60 respondents is selected & each respondent is instructed to keep a detailed record of all TV viewing in a particular week. The results of the sample indicate the average viewing time is 37 hours & the standard deviation is 4.8 hours. 36 have HD TVs on at least 1 television set.

A. Construct a 90% confidence interval estimate for the mean content viewing time per week in this area.

B. Construct a 90% confidence interval estimate for the population proportion of residents who have HD on at least 1 television set.

C. Suppose that the market researcher wants to take another survey in a different location. What sample size is required to be 90% confident of estimating the population mean content viewing time to within +/-2 hours assuming that the standard deviation is 7 hours

d. How many respondents need to be selected to be 90% confident of being within +/-0.05 of the population proportion who have had on at least one television set if no prior estimate is available?

E. Based on c and d how many respondents should the market researcher select if a single survey is being conducted?

math   Statistics-And-Probability   
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Answer #1

2- will bt 33.965, 38.03S 0 be 0.60 + 0.ro ● 10.496 , 0.904

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