Confidence interval for average annual savings

Reference no: EM131372630

According to the Wall Street Journal, an average of 44 tons of carbon dioxide will be saved per year if new, more efficient lamps are used.

Assume that this average is based on a random sample of 15 test runs of the new lamps and that the sample standard deviation was 18 tons. Give a 90% confidence interval for average annual savings.

Reference no: EM131372630

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