2) Sample mean can be used to make estimations of population mean. Considering the following example: It is known that population standard deviation is 11 days for the days of absence per worker per year in an industry. A random sample of 100 workers gives a mean of 8 days` absence. a. Please calculate the standard error of the sample mean. b. Please construct 95 percent confidence intervals for the population mean (Z0.025 = 1.96). c. Please construct 99 percent confidence intervals for the population mean (Z0.005 = 2.575). d. Comparing your answers from subquestions b and c, sustained your findings.

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A: Odd ratio of 2 groups  and aggregate are obtained

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A: F= 1.36 Df1 =15 DF2 = 23

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A: The dot-plots of the distribution are given as follows: