Current Attempt in Progress The standard deviation for a population is o = 14.8. A sample of 21 observations selected from this population gave a mean equal to 141.55. The population is known to have a normal distribution. Round your answers to two decimal places. a. Make a 98% confidence interval for /. i b. Construct a 95% confidence interval for /. i c. Determine a 90% confidence interval for /. i d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases?View Policies Current Attempt in Progress For a population data set, o = 13.50. a. What should the sample size be for a 98% confidence interval for / to have a margin of error of estimate equal to 6.10? n = b. What should the sample size be for a 95% confidence interval for / to have a margin of error of estimate equal to 4.46? n = e Textbook and Media Save for Later Attempts: 0 of 5 used Submit AnswerView Policies Current Attempt in Progress Determine the sample size for the estimate of,\" for the following. E = 1.6535 = 5.82, condence level : 96%. Round your answer up to the nearest whole number. n : n eTextbook and Media Save for Later Attempts: 0 of 5 used View Policies Current Attempt in Progress Determine the sample size for the estimate of,\" for the following. E = 5.45,6 = 18.22, condence level = 90%. Round your answer up to the nearest whole number. '12\" eTextbook and Media Save for Later Attempts: 0 of 5 used