A Test of Spelling Ability Is Given to a Random $\alpha$

question 177

Essay

A test of spelling ability is given to a random sample of 10 students before and after they completed a spelling course. The mean score before the course was 119.60 and after the course the mean score was 130.80. The standard deviation of the difference was 16.061. Assume that the difference in scores is normally distributed.
-Test the hypothesis at $\alpha$
=.05

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