Question

What is the life span of a lab mouse? You measured the following life spans (in days) for a certain standard inbred laboratory strain. 1025, 821.419, 771, 486, 1017, 657, 1151, 700, 752, 807, 924, 703, 1035 You may assume for the following questions that the distribution of life span is normal. (a) Calculate the sample mean x. 804.8571 b) Calculate the sample standard deviation s.210.9385 (c) Calculate the critical value tfor a 87 percent two-sided confidence interval. 1.1616X (a) Calculate the margin of error m for a two-sided confidence interval. m91.1031 X (e) The lower bound of the two-sided confidence interval is 713.7540 X and the upper bound of the two-sided confidence interval is 895.9602 X f Calculate the critical value*for the 87 percent lower-bound confidence interval. 1.1616 X (g) Calculate the lower bound of the 87 percent lower-bound confidence interval. We can be 87 percent confident that the mean life span of the lab mouse is more than 714 h) Calculate the upper bound of the 87 percent upper-bound confidence interval. We can be 87 percent confident that the mean life span of the lab mouse is less than 896 Please note that you must decide which of the three confidence intervals you wish to calculate before you look at the data. In particular, the confidence intervals in (g) and (h) are not x days. X days. Check

Answer 1

Anss en dl (ol3, 653,15,7ce,752, (035, 821, 4(9,9귀, 4g6, 807, 924, 703, lu35. e 1385 ly 1 1.136 13.311 95.983