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Suppose a Pizza-In store manager believes the average number of customers who order take-out is 20 per day. The store gathers a sample of data by recording the number of take-out orders for each of the 26 days it was open during a given month. The mean is calculated to be 22, and the standard deviation to be 4. Does the number of take-out orders differ from 20 per day? Follow the steps below. 1. State an appropriate null hypothesis and alternative hypothesis. 2. Find the critical values at significant level α =.05 (see t-table in Module C2) 3. Calculate the t-statistic. 4. Compare t-statistic with critical values. 5. Make a decision.
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