Two Sample T Test Confidence Interval Formula. The standard error of the difference is 6 84 units and the margin of error is 15 77 units. For this statistic we add the sample variance of the samples and then take the square root.
Mean of the first sample. T 0 025 10 10 2 t 0 025 18 2 101. S1 2 n1 s22 n2 1 2.
The 95 confidence interval for the difference in mean systolic blood pressures is.
Independent samples confidence interval calculator. The sample size n is 30. Finding the standard deviation. This means that to calculate the upper and lower bounds of the confidence interval we can take the mean 1 96 standard deviations from the mean.
