Assume that the differences are normally distributed. Complete parts (a) through (d) below.

Observation

1

2

3

4

5

6

7

8

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Upper X Subscript iXi

49.049.0

52.152.1

44.544.5

44.444.4

54.554.5

45.045.0

46.146.1

46.646.6

Upper Y Subscript iYi

50.850.8

51.451.4

48.748.7

48.648.6

54.154.1

45.345.3

46.746.7

47.347.3

(a) Determine

d Subscript i Baseline equals Upper X Subscript i Baseline minus Upper Y Subscript idi=XiYi

for each pair of data.

Observation

1

2

3

4

5

6

7

8