Business Stats 200 Please put all short answers on the Exam 3 Excel file answer sheet. Hand in your answer sheet, final exam, and blue book together. Email If n 2 65, you may use normal distribution in all cases. Use Hypothesis Testing for problems: 1) Records on a fleet of trucks reveal that the average life of a set of spark plugs is normally distributed with a mean of 22,100 miles. A manufacturer of spark plugs claims that its plugs have an average life in excess of 22,100 miles. The fleet owner purchased 25 sets and found that the sample average life was 23,400 miles, the sample standard

Business Stats 200 Please put all short answers on the Exam 3 Excel file answer sheet. Hand in your answer sheet, final exam, and blue book together. Email If n 2 65, you may use normal distribution in all cases. Use Hypothesis Testing for problems: 1) Records on a fleet of trucks reveal that the average life of a set of spark plugs is normally distributed with a mean of 22,100 miles. A manufacturer of spark plugs claims that its plugs have an average life in excess of 22,100 miles. The fleet owner purchased 25 sets and found that the sample average life was 23,400 miles, the sample standard deviation was 1,500 miles. Use the 05 level of significance, conduct a Hypothesis test a) State the and Alternate Hypothesis. b) Which test statistic does the data call for (which distribution)? Explain why you chose that distribution. c) State the decision rule and Critical Value d) Compute the Test Statistic and p value. e) What is your decision concerning hypothesis? Re-compute the test statistic if “n” is increased to 100. What is your decision then?

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