PLEASE HELP WITH THESE THREE QUESTIONS ( IMPORTANT) THANK YOU IN ADVANCE! onstru

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PLEASE HELP WITH THESE THREE QUESTIONS ( IMPORTANT) THANK YOU IN ADVANCE!

onstruct a 90% confidence interval for the population mean repair cost. Interpret t in a random sample of 35 refrigerators, the mean repair cost was $ 129.00 and the population standard deviation is $17.20 results. Construct a 90% confidence interval for the population mean repair cost. 90% confidence interval is UID (Round to two decimal places as needed.) terpret you results. Choose the correct answer below. ) A. The confidence interval contains 90% of the mean repair costs. B, With 90% confidence, it can be said that the confidence interval contains the true mean repair cost. C. With 90% confidence, it can be said that the confidence interval contains the sample mean repair cost.

Explanation / Answer

Image - 1: The statistical software output for this problem is:

One sample Z summary confidence interval:
: Mean of population
Standard deviation = 17.2

90% confidence interval results:

Hence,

90% confidence interval: (124.22, 133.78)

Option B is correct.

Image - 2: Critical value = 1.708

Image - 3: Margin of error = 3.5

Mean n Sample Mean Std. Err. L. Limit U. Limit 35 129 2.9073306 124.21787 133.78213

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