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Q1) To evaluate the true mean weight of packages received by parcel service, 39 packages are arbitrarily chosen and weighed. Sample has mean weight of 15.3 pounds and standard deviation of 1.9 pounds. Construct a 95% confidence interval estimate for true mean weight of all packages received by parcel service.

Q2) Sociologist develops the test to measure attitudes about public transportation, and 27 arbitrarily chosen subjects are given test. Their mean score is 76.2 and their standard deviation is 21.4. Create the 90% confidence interval for mean score of all such subjects. You may suppose scores are usually distributed.

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Category:- Statistics and Probability
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