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You wish to find a 95% confidence interval for the mean number of times men change...

You wish to find a 95% confidence interval for the mean number of times men change channels with a remote control during a commercial. Based on a preliminary study, you estimate σ = 15. How many commercials' worth of data do you need to have a margin of error no more than 3?

a) 10

b) 97

c) 96

math   Statistics-And-Probability   
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