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
Mathematics, 21.06.2019 16:30
Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?
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Mathematics, 22.06.2019 00:30
$5400 is? invested, part of it at 11? % and part of it at 8? %. for a certain? year, the total yield is ? $522.00. how much was invested at each? rate?
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1. In a random sample of 40 refrigerators, the mean repair cost was $150. Assume the population stan...
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