Hypothesis test for a population mean_2_SP2014

Hypothesis test for a population mean_2_SP2014 - ECO 221 SP...

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ECO 221, SP 2014 Rollins College Prof. M. Vidovic Hypothesis Test for a Population Mean Due Monday, April 7, 2014 Follow the Steps in Hypothesis Testing 1. Describe the population characteristic about which the hypotheses are to be tested. 2. State the null and the alternative hypotheses 3. Choose the significance level, α 4. Find the critical value(s) and state the decision rule. 5. Compute the test statistic and check the assumptions required for the test statistic are reasonable 6. Make decision: reject the null or do not reject the null 7. State the conclusion 1. Recently, Seasons Pizza has begun receiving complaints from customers about the amount of time they wait for their pizza deliveries. To address this issue, Seasons made some operational changes and added more delivery people to its staff. The restaurant would now like to test the hypothesis that the average time is less than 30 minutes. The average delivery time for a random sample of 12 delivery people was 27.75 minutes with a sample standard deviation of 6.74 minutes.
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