Currently, 20% of potential customers buy soap of brand A.
Chapter 10, Problem 119SE(choose chapter or problem)
Problem 119SE
Currently, 20% of potential customers buy soap of brand A. To increase sales, the company will conduct an extensive advertising campaign. At the end of the campaign, a sample of 400 potential customers will be interviewed to determine whether the campaign was successful.
a State H0 and Ha in terms of p, the probability that a customer prefers soap brand A.
b The company decides to conclude that the advertising campaign was a success if at least 92 of the 400 customers interviewed prefer brand A. Find α. (Use the normal approximation to the binomial distribution to evaluate the desired probability.)
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