Question

Suppose we obtained data on vein size after application of a nitroglycerin ointment in a sample of 50 patients. The mean vein size is found to be 8.7mm with an SD of 2.1. Using a t distribution table, what are the confidence limits for a 95% confidence interval? For a 99% confidence interval?

Answer 1

95% confidence interval results: CI between lower limit 8.103166mm and upper limit 9.2968134mmμ : Mean of populationMeanSampleMeanStd. Err.DFL. LimitU. Limitμ8.70.29698485 498.10318669.296813499% confidence interval results:CI between lower limit 7.9040949mm and upper limit 9.4959051mmμ : Mean of populationMeanSampleMeanStd. Err.DFL. LimitU. Limitμ8.70.29698485 497.90409499.495905