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Confidence interval for the population mean

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Reference no: EM131109112

In a random sample of 12 adults from the U.S., the mean waste recycled per person per day was 1.4 pounds with a sample standard deviation of .3 pounds. Assume that the distribution of x = waste recycled per person per day is normal

(a) Construct a 95% confidence interval for the population mean.

(b) Instead of using the sample standard deviation, suppose you have historical data which indicates that the population standard deviation is .25 pounds. Construct a 95% confidence interval using this new information.

(c ) Would your answer change if you did not know that the distribution of x = waste recycled per person per day is normal?

Reference no: EM131109112

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