Suppose a Pizza In store manager believes the average number of customers who order take-out is 22 per day. The store gathers a sample of data by recording the number of take-out orders for each of the 40 days it was open during a given month. Are the return complaint observations different that 22 per day. The mean is calculated to be 20, and the standard deviation to be 4.8. Does the number of take-out orders differ from 18 per day? Follow the steps below.

1. State an appropriate null hypothesis and alternative hypotheses.

2. Find the critical values at significant level α = .05.

3. Calculate the T-statistic.

4. Compare t-statistic with critical values.

5. Make a decision.

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