S education.wiley.com C + 88 Bing Google Yahoo Apple Bing Google Disney ESPN Yahoo! ! Suggested Sites Free Hotmail RealPlayer Apple e Web Slice Gallery Hiawatha CUSD #426 Mail WP New Assignment 8 WP NWP Assessment Player UI Application Course Hero New Assignment 8 Question 2 of 10 > -11 3 View Policies Current Attempt in Progress The standard deviation for a population is o = 15.4. A sample of 19 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 99% confidence interval for u. i b. Construct a 97% confidence interval for u. i c. Determine a 95% confidence interval for M. i d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases? 4 eTextbook and Media Save for Later Attempts: 0 of 3 used Submit