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Bob's Sporting Goods believes the average age of its customers is 40 or less. A random sample of 60 customers was surveyed, and the average customer age was found to be 42.7 years. Assume the standard deviation for customer age is 8.0 years. Using a = 0.02, answer the following questions:
a) Does this sample provide enough evidence to refute the age claim made by Bob's Sporting Goods?
b) Determine the p-value for this test.
c) Identify and interpret the critical sample mean or means for this problem.
d) Verify your results using PHStat2.
Random sample of 40 November days (taken over many years)? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.
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Judy's measured potassium level varies according to the Normal distribution with mean = 3.8. If a single potassium measurement is made, what is the probability that Judy is diagnosed as hypokalemic?
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