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
102
85
120
109
119
94
75
107
98
88
Test B
102
85
120
110
115
94
76
113
100
88
1. Consider (Test A - Test B). Use a 0.01 significance
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 a 99% confidence interval for the mean of the
differences. Again, use
(Test A - Test B).
………….< u <…………..