(2 points) Ten randomly selected people took an IQ test A, and next day they took a very similar IQ test B. Their scores are shown in the table below.

Person ABCDEFGHIJ

Test A 95 97 85 127 90 100 119 108 78 106

Test B 94 99 87 130 87 105 125 106 77 111

1. Consider (Test A - Test B). Use a0.05

0.05significance level to test the claim that people do better on the second test than they do on the first. (Note: You may wish to use software.)

(a) What test method should be used?

A.Two Sample t

B.Two Sample z

C.Matched Pairs

(b) The test statistic is

(c) The critical value is

(d) Is there sufficient evidence to support the claim that people do better on the second test?

A.No

B.Yes

2. Construct a95

95% confidence interval for the mean of the differences. Again, use (Test A - Test B).

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