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to estimate the population mean repair cost of microwave ovens in macomb, a random sample of...

to estimate the population mean repair cost of microwave ovens in macomb, a random sample of 9 broken microwave ovens was selected and it is found that the sample mean repair cost was $80 with a sample standard deviation of $15.

1) what would be the “critical value” if you want to find a 95% confidence interval for the population mean?

2) what would be the “margin of error” if you want to find a 95% confidence interval for the population mean?

3) what would be the “length” of the 95% confidence interval?

4) what would happen to 95% confidence interval if we decrease the sample size from 9 to 4?
enter the answer by writing “wider” or “narrower”
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