Mathematics, 11.12.2021 07:10 brennae8529
1. In a random sample of 40 refrigerators, the mean repair cost was $150. Assume the population standard deviation σ = $15.5.
a. Construct a 99% confidence interval for the population mean repair cost. Interpret the
interval in the context of the problem. [Use Algebra]
b. Repeat exercise 1(a), changing the sample size to n = 60. Which confidence interval has
better estimate? Why? Explain? [Use Algebra]
c. Repeat exercise 1(a), using a population standard deviation of σ = $19.5. Which
confidence interval is wider? Explain? [Use Algebra]
Answers: 2
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