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The following table contains information on matched sample values whose differences are normally distributed. Use Table 2.

Number

Sample 1

Sample 2

1

18

22

2

12

13

3

20

24

4

21

20

5

19

22

6

13

19

7

18

16

8

17

19

a.

Construct the 95% confidence interval for the mean difference ?D. (Negative values should be indicated by a minus sign. Round all intermediate calculations to at least 4 decimal places. Round your answers to 2 decimal places.)

Confidence interval is n/r to n/r

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