Paired T Test Confidence Interval Formula. The paired t test statistics value can be calculated using the following formula. So a significance level of 0 05 is equal to a 95 confidence level.
Making a t interval for paired data. The formula for the paired t test is given by t frac sum d sqrt frac n sum d 2 sum d 2 n 1 where σd is the sum of the differences. N is the sample size i e size of d.
Making a t interval for paired data.
The general form for a confidence interval around a difference in means is for a two sided 95 confidence interval use the table of the t distribution found at the end of the section to select the appropriate critical value of t for the two sided α 0 05. 90 confidence interval estimate for difference is. Thus 90 confidence interval estimate for mean of the difference is 2 123 3 877. We now put everything together and see that our margin of error is 2 09 x 1 2583 which is approximately 2 63.
