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.Calculate a 99% confidence interval.
A)(-3.13 25.53)
B)(6.12 16.28)
C)(-1.88 24.28)
D)(-5.31 27.71)

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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.Calculate a 99% confidence interval.
A)(-3.13 25.53)
B)(6.12 16.28)
C)(-1.88 24.28)
D)(-5.31 27.71)

A Test of Spelling Ability Is Given to a Random