The sample standard deviation for a tire life data was 3600.90 kilometers and n = 15. (a) Can you conclude using = 0.05, that the standard deviation of tire life is less than 3950 kilometers? State any necessary assumptions about the underlying distribution of the data. Find the P-value for this test. (b) Explain how you could answer the question in part (a) by constructing a 95% one-sided confidence interval on .