O Menu Homework Help - Q&A fro X zy Section 6.2 - MAT 240: App X + Q X > =zyBooks My library > MAT 240: Applied Statistics home > 6.2: Confidence intervals for population means zyBooks catalog ? Help/FAQ Challenge activities CHALLENGE ACTIVITY 6.2.1: Confidence intervals for population means. 387962.2528628.qx3zay7 Jump to level 1 Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 3 inches. The heights of 7 randomly selected students are 60, 65, 61, 70, 65, 72 and 74. T = EX: 12.34 Margin of error at 99% confidence level = Ex: 1.23 99% confidence interval = [ Ex: 12.34 Ex: 12.34 ] [smaller value, larger value] 1 2 Check Next Feedback? CHALLENGE ACTIVITY 6.2.2: Relating confidence intervals to hypothesis testing (one sample). V O w 10:25 AM 4/9/2022