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Question 10 [5 A sample of4D observations is selected from a normal population where the population standard deviation is 25. The sample mean is 75.

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Question 10 [5 A sample of4D observations is selected from a normal population where the population standard deviation is 25. The sample mean is 75. a. Determine the standard error of the mean. b. Determine the 90% confidence interval for the population mean. c. If you wanted a wider intervall would you increase or decrease the confidence level

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