Compute 95 percent confidence interval for mean percentage, Ask an Expert

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Assume that the random sample of 400 US advertising agencies gives average percentage share of billing volume from network television equal to 7.46 percent, and suppose that σ equals 1.42 percent. Compute 95 percent confidence interval for mean percentage share of billing volume from network television for population of all US advertising agencies.

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Category:- Statistics and Probability
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