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.Based on this information,the t-test statistic is _____.
A)1.12
B)1.02
C)1.61
D)2.01
E)2.21

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The Answer of 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.Based on this information,the t-test statistic is _____.
A)1.12
B)1.02
C)1.61
D)2.01
E)2.21

A Test of Spelling Ability Is Given to a Random