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x Course Home Page x Do Homework Mike Tu x Devry University C Secure https &flushed; false aaclda427s478&back; DoAssignments aspx l.com/Student/Player Homework aspx?home 4064097458 questionl Statistics for Decision Making (100) Mike Tunberg & Save Homework: Week 6 Homework 40 pts 8 of 15 (14 complete HW Score: 42.5%. 17 of 40 pts Score 0 of 2 pts Question Help X 6.2.11 Construct the indicated conndence interval for the population mean uusing a t-distribution. C-0.90, x 3, 5 The confidence interval is (OD (Round to the nearest tenth as needed.) Enter your answer in the edit fields and then click Check Answer All parts showing Clear All 7:45 PM Ask me anything 2/12/2017 R13Explanation / Answer
n = 9
x-bar = 113
s = 10
% = 90
Standard Error, SE = s/Ön = 10/9 = 3.333333333
Degrees of freedom = n - 1 = 9 -1 = 8
t- score = 1.859548033
Width of the confidence interval = t * SE = 1.85954803330183 * 3.33333333333333 = 6.198493444
Lower Limit of the confidence interval = x-bar - width = 113 - 6.19849344433942 = 106.8015066
Upper Limit of the confidence interval = x-bar + width = 113 + 6.19849344433942 = 119.1984934
The 90% confidence interval is [106.8, 119.2].
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