Is there a difference between the mean IQ scores for the oldest and youngest child in...
Is there a difference between the mean IQ scores for the oldest and youngest child in the family? Eleven sibling pairs were given IQ tests. The data is shown below.
| Younger | 104 | 96 | 102 | 125 | 86 | 100 | 90 | 117 | 102 | 110 | 81 |
| Older | 107 | 97 | 99 | 131 | 90 | 96 | 94 | 117 | 108 | 114 | 82 |
Assume the distribution of the differences is normal. What can be concluded at the 0.05 level of significance? (d = Younger Sibling IQ - Older Sibling IQ)
H0: d = 0 A. <
B. >
C. Not equal to
Test statistic: A. -2.43
B. -1.98
C. 1.01
D. 1.99
Critical value(s): A. 2.33
B. -2.23, 2.23
C. 1.645
D. -1.96, 1.96
p-Value (round answer to three decimal places): A. 0.142
B. 0.332
C. 0.076
D. 0.038
A. Fail to reject the null hypothesis
B. Reject the null hypothesis
A. Inusuficientt data
B. Sufficient data
Homework Answers
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Is there a difference between the mean IQ scores for the oldest
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