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A change store claims that the mean of waiting time is 3.5 minutes. A regular customer...

A change store claims that the mean of waiting time is 3.5 minutes. A regular customer who happened to be taking a statistics and probability class believes that the wait time is longer. The student then gathers a random sample of 20 customers which has a mean of 3.8 minutes with a standard deviation of 0.5 minute. If alpha=0.05, test the store's claim.

Ho:

H1:

Test statistic:

Critical value:

P value:

Conclusion:

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