According to the wall street journal

Reference no: EM131058193

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 25 test runs of the new lamps and the sample standard deviation was 19 tons. Give a 90% confidence interval for the average annual savings.

Reference no: EM131058193

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