IE 360 Homework Assignment #6 Solutions •8-44 •8-50 a only •9-36 a only •9-53 a & b only •9-54 a only •9-70 •9-73 •9-80 •9-86 a only •9-89 a only ** Note: several of the Chapter 9 questions ask you to find a P-value – you can skip this part of the question. You do not need to find P-values. 8-44 95% confidence interval for σ99.1541==sn34.59240,025.021,2/==−χχαnand 43.24240,975.021,2/1==−−χχαn46.2013.13633.41835.17243.24)99.15(4034.59)99.15(402222<<≤≤≤≤σσσThe data don’t appear to be normally distributed based on examination of the normal probability plot below. Therefore, there is not enough evidence to support that the time of tumor appearance is normally distributed. So the 95% confidence interval for σis invalid. TimeOfTumorPercent140120100806040999590807060504030201051Mean<0.00588.78StDev15.99N41AD1.631P-ValueProbability Plot of TimeOfTumorNormal - 95% CI
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