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A phone industry manager thinks that customer monthly cell phone bills have increased, and have average...

A phone industry manager thinks that customer monthly cell phone bills have increased, and have average over $32 per month. The company wishes to test this claim.(Assume o =12 is known) suppose a sample is taken with the following results: N = 64, mean(x) =53.

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Answer #1

This hypothesis test is a right tailed test .

The null and alternative hypothesis is

H0 : = 32

Ha : > 32

Test statistic = z

= ( - ) /    / n

= (53 - 32) / 12 / 64

Test statistic = 14

P-value = 0

P-value < = 0.05

Reject the null hypothesis .

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