True mean difference in the two techniques

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An auditor for a hardware store chain wished to compare the efficiency of two different auditing techniques. To do this he selected a sample of nine store accounts and applied auditing techniques A and B to each of the nine accounts selected. The number of errors found in each of techniques A and B is listed in the table below

Errors in A

Errors in B

25

11

28

17

26

19

28

17

32

34

30

25

29

29

20

21

25

30

Select a 90% confidence interval for the true mean difference in the two techniques

Reference no: EM131042183

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