Question

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	104	98	89	117	107	120	80	109	94	85
Test B	102	99	88	117	111	119	83	107	95	88

1.    Use a 0.05 significance level to test the claim that people do better on the second test than they do on the first.
The test statistic is  
The critical value is  
Is there sufficient evidence to support the claim that people do better on the second test?

A. No
B. Yes

2.    Construct a 95% confidence interval for the population mean of all differences, Test A - Test B.
<μ<

Answer 1