Question: 67. Referring to Problem 3 of Section 8.7, test at the 5% level of significance the hypothesis that the proportions of the population favoring brand

67. Referring to Problem 3 of Section 8.7, test at the 5% level of significance the hypothesis that the proportions of the population favoring brand X before and after the advertising campaign are the same, that is, H0: p1 − p2 = 0 versus H1: p1 − p2 = 0.

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