M Your answer is ready - Ipearl@co x | Course Hero * | Home x zy Section 6.2 - MAT 240: Applied S Radio 95.1 - Rochester's Rad 41 x Course Hero @ @ learn.zybooks.com/zybook/MAT-240-15406-OL-TRAD-UG.22EW5/chapter/6/section/2 C A coursehero.com/qa/wait/41782513/ zyBooks My library > MAT 240: Applied Statistics home > 6.2: Confidence intervals for population means zyBooks catalog ? Help/FAQ @ Kristin Segovia josephmagno321 Answered 7 minutes ago Feedback ? X = 64.78 Challenge activities Margin of error =2.58 CHALLENGE ACTIVITY 6.2.1: Confidence intervals for population means. 99% CI = [62.20, 67.36] Jump to level 1 Explanation: x = [x = 583/9 = 64.78 Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 6 inches. The heights of 10 andomly selected students are 68, 72, 66, 64, 61, 65, 74, 68, 73 and 70. Margin of error = z[o /vn] Margin of error = 2.576[3/V9] X = Ex: 12.349 Margin of error =2.58 Margin of error at 90% confidence level = Ex: 1.23 99% CI = X : margin of error 99% CI = 64.78 + 2.58 90% confidence interval = [ Ex: 12.34 , Ex: 12.34 ] 99% CI = [62.20, 67.36] [smaller value, larger value] Thank you for your feedback Check Next We're glad that it was helpful! Keep your study momentum going Ask a new question Feedback? Add a comment if you have any follow-up question about this answer CHALLENGE 6.2.2: Relating confidence intervals to hypothesis testing (one sample). Send ACTIVITY 402594.25 Start As stated in our Honor Code, you should never copy these answers as your own. Tutors are here to help show you how you can solve this question next time on your own. An auto maker is interested in information about how long transmissions last. A sample of transmissions are run constantly and the number of miles before the transmission fails is recorded. The auto maker claims that the transmissions can run constantly for over 150,000 miles before failure. The results of the sample are given below. 1:46 AN 6/8/2022 Type here to search 68.F Partly sunny ~4 6/81202