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Quiz 4 A sample of 25 observations is selected from a normal population for which the population standard deviation is 9. The sample mean is 50. (a) Find a 99% confidence interval for population mean. (3 m) (b) Do you think that the width of 95% confidence interval will be wider than 99% confidence interval? Explain your answer. (2 m) (c) If we get another sample of 36 observations from this population, find the 99% confidence interval for population mean. What is the effect on the confidence interval when the sample size is increased from 25 to 36? (5 m E Section: 1/1 SetValue: 4.7cm Row: 8 Column: 18 Words: 116 |Spell Check