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	A	B	C	D	E	F	G	H	I	J
Test A	100	109	107	89	121	118	76	93	104	85
Test B	102	109	107	90	122	125	76	95	106	84

Consider (Test A - Test B). Use a0.05significance level to test the claim that people do better on the second test than they do on the first. Assume differences are normal. (Note: You may wish to use software.)

(a) The test statistic is (at least 2 digits after the decimal)

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(b) The critical value is (at least 3 digits after the decimal)

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(c) Is there sufficient evidence to support the claim that people do better on the second test? A.Yes B.No (d) Construct a95% confidence interval for the mean of the differences. Again, use (Test A - Test B) Use 3 digits after the decimal.

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