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The manager of a grocery store has taken a random sample of 4 customers. The average...

The manager of a grocery store has taken a random sample of 4 customers. The average length of time it took the customers in the sample to check out was 6 minutes. The population standard deviation is known to be 0.1 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 7 minutes. Use a significance level of (alpha = 0.01). Please show work.

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