A random sample of six music students played a short song, and the number of mistakes in music each student made was recorded. After they practiced the song 5 times, the number of mistakes each student made was recorded. The data are shown. Student A B C D E F Before 10 6 8 8 13 8 After 4 2 2 7 8 9 d= Before -After 6 4 6 1 5 -1 Construct 99% confidence interval of the difference in means. (  ? , ? )

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A random sample of six music students played a short song, and the number of mistakes in music each student made was recorded. After they practiced the song 5 times, the number of mistakes each student made was recorded. The data are shown.

Student

A

B

C

D

E

F

Before

10

6

8

8

13

8

After

4

2

2

7

8

9

d= Before -After

6

4

6

1

5

-1

Construct 99% confidence interval of the difference in means.

(  ? , ? )

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