1.) 5 students were given an English test before and after receiving instruction on basic grammar. Their scores are as follows:

Student Before After

a 20 20

b 14 22

c 13 18

d 14 17

e 12 16

a) Calculate and appropriate t-test using those data. Based on your results, is it reasonable top conclude that future students would show higher scores after instruction? Why /why not?

b) Calculate the effect size as well as the confidence interval for the results in part a). What do these mean?

I am confused on your confidence intervals. Would the Tcrit of be equivalent to 2.132 and not 2.776 like you have derived. This is a one tailed test correct? I got for the CI@95% (1.223, 6.777)