A sample of seven students who were given a GMAT test before and after they took instructional review classes had the following scores. A redesign of the layout took place, we'll be adding more than 100 solved statistics problems. State which test should be used and explain why it is the appropriate test for this problem.

At the 0.05 level of significance, can we conclude that the instructional review classes were helpful? Since the statistic is greater than the critical value, we reject the null hypothesis of, and we can conclude that the instructional review classes were helpful.

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