Slide 1

Slide 2 t-test 1-sample t-test or correlated-sample t-test or paired-sample t-test 2-sample t-test or independent-sample t-test or unpaired-sample t-test compare the mean of the difference between 2 groups of data compare the difference of the mean of 2 groups of data Slide 3 Group 1Group 2difference 812- 4 1015- 5 1218-6-6 Mean SD10 215 3- 5 1 Example of t-test: t-test 2-sample t-test 1-sample t-test compare: 10 2 versus 15 3 - 5 1 versus 0 Slide 4 1-sample t-test: compare the mean of the difference... H o : X = 0 {for 2-tail p-value} H a : X 0 test statistic: and Slide 5 1-sample t-test: compare the mean of the difference... H o : X 0 {for 1-tail p-value} H a : X < 0 test statistic: and Slide 6 2-sample t-test: compare the difference of the mean... H o : X 1 = X 2 {for 2-tail p-value} H a : X 1 X 2 test statistic: at n 1 = n 2 = n, SD 1 = SD 2, and x = {its similar to the test statistic for the 1-sample t-test} and Slide 7 2-sample t-test: compare the difference of the mean... H o : X 1 X 2 {for 1-tail p-value} H a : X 1 > X 2 test statistic: at n 1 = n 2 = n and x = {its similar to the test statistic for the 1-sample t-test} and