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Please Give all the answers.
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answerhappygod
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Please Give all the answers.
Please Give all the answers.
2. 5 The standard deviation for a population is 14.8. A sample of 25 observations selected from this population gave a mean equal to 143.72. The population is known to have a normal distribution. a. Make a 99% confidence interval for the population mean. b. Construct a 95% confidence interval for the population mean. c. Determine a 90% confidence interval for the population mean. d. Does the width of the confidence intervals constructed in parts a through decrease as the confidence level decreases? Explain your answer.
2. 5 The standard deviation for a population is 14.8. A sample of 25 observations selected from this population gave a mean equal to 143.72. The population is known to have a normal distribution. a. Make a 99% confidence interval for the population mean. b. Construct a 95% confidence interval for the population mean. c. Determine a 90% confidence interval for the population mean. d. Does the width of the confidence intervals constructed in parts a through decrease as the confidence level decreases? Explain your answer.