One Sample T Test Confidence Interval Formula. T x y μ x μ y s p 1 n 1 m t n m 2. View w8 one sample t test docx from cit 101 at los angeles pierce college.
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The sample standard deviation s is 0 4. We are 95 confident that the average difference between the pretest and the post test is between 5 9 points and 23 88 points. T confidence interval formula confidence t alpha standard dev size the function uses the following arguments.
Sm standard error s2 n.
And then it is just a matter of manipulating the inequalities inside the parentheses. And then it is just a matter of manipulating the inequalities inside the parentheses. Therefore the confidence interval at 99 confidence level is 3 17 to 3 43. In this case the sample mean is 4 8.
