Determine confidence interval estimate for the mean weight

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Discussion a: In order to determine the average weight of carry-on luggage by passengers in airplanes, a sample of 250 pieces of carry-on luggage was collected and weighed. The average weight was 20 pounds. Assume that we know the standard deviation of the population to be 2.5 pounds.

1. Determine a 95% confidence interval estimate for the mean weight of the carry-on luggage. 2. Explain how you know whether to use z or t values in these types of problems.

Discussion b: A statistician employed by a consumer testing organization reports that at 95% confidence he has determined that the true average content of the Uncola soft drinks is between 11.8 to 12.2 ounces. He further reports that his sample revealed an average content of 12 ounces, but he forgot to report the size of the sample he had selected. Assuming the standard deviation of the population is 1.25, determine the size of the sample.

Reference no: EM132596831

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