A television network wants to estimate the average number of hours of TV watched each week by viewers. The network decides to create a 95% confidence interval for the average number of hours of TV watched each week. How large of a sample size of viewers should be used to create this confidence interval if the television network wants to be 95% confident that the sample mean is within 1 hour of the population mean? Assume the standard deviation for the number of hours of TV watched each week is 5. z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 Select the correct answer below: 96 viewers 90 viewers 97 viewers 55 viewers
Added by Stanley M.
Step 1
We want a 95% confidence interval, so we need to find the z-score corresponding to 0.025 in each tail (since 95% is in the middle, leaving 2.5% in each tail). From the given table, we find that z0.025 = 1.960. Show more…
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