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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?

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