Average IQ scores for young school children are known to be 100 (SD = 15). However, the literature indicates that children’s intelligence may be decreased if their mothers have German measles during pregnancy. Using hospital records, a researcher obtained a sample of n = 25 school children whose mothers all had German measles during their pregnancies. Do the data indicate that children born to mothers who had German measles during the pregnancy have significantly lower IQ scores than typical young school children? DATA (Fictional) child IQ scr 1 91 2 111 3 97 4 95 5 96 6 95 7 95 8 96 9 94 10 93 11 95 12 92 13 96 14 91 15 97 16 93 17 92 18 99 19 93 20 97 21 85 22 94 23 96 24 95 25 96 Looking at the research scenario for this lab, you will see that it says, “ literature indicates that children’s intelligence may be decreased if their mothers have German measles during pregnancy” A. If our level of significance (alpha) was set at p< .05 (5%), the critical s-scores would be established so that 05 (5%) is in the left-tail and 0.00 (0%) is in the right-tail 00 (0%) is in the left-tail and 0.05 (5%) is in the right-tail 025 (2.5%) is in the left-tail and 0.0.25 (2.5%) is in the right-tail None of the above B. Given that for a one-tail test: p(z-score< -1.64) = 5% , what is our critical value? C. Comparing our calculated z score (from # 14) to the critical value above, would we conclude that the children’s intelligence is or is not affected if their mothers have German measles during pregnancy? D. Do we reject or fail to reject (accept) the NULL hypothesis?
Average IQ scores for young school children are known to be 100 (SD = 15). However, the literature indicates that children’s intelligence may be decreased if their mothers have German measles during pregnancy. Using hospital records, a researcher obtained a sample of n = 25 school children whose mothers all had German measles during their pregnancies. Do the data indicate that children born to mothers who had German measles during the pregnancy have significantly lower IQ scores than typical young school children?
DATA (Fictional)
|
child |
IQ scr |
|
1 |
91 |
|
2 |
111 |
|
3 |
97 |
|
4 |
95 |
|
5 |
96 |
|
6 |
95 |
|
7 |
95 |
|
8 |
96 |
|
9 |
94 |
|
10 |
93 |
|
11 |
95 |
|
12 |
92 |
|
13 |
96 |
|
14 |
91 |
|
15 |
97 |
|
16 |
93 |
|
17 |
92 |
|
18 |
99 |
|
19 |
93 |
|
20 |
97 |
|
21 |
85 |
|
22 |
94 |
|
23 |
96 |
|
24 |
95 |
|
25 |
96 |
Looking at the research scenario for this lab, you will see that it says, “ literature indicates that children’s intelligence may be decreased if their mothers have German measles during pregnancy”
A. If our level of significance (alpha) was set at p< .05 (5%), the critical s-scores would be established so that
- 05 (5%) is in the left-tail and 0.00 (0%) is in the right-tail
- 00 (0%) is in the left-tail and 0.05 (5%) is in the right-tail
- 025 (2.5%) is in the left-tail and 0.0.25 (2.5%) is in the right-tail
- None of the above
B. Given that for a one-tail test: p(z-score< -1.64) = 5% , what is our critical value?
C. Comparing our calculated z score (from # 14) to the critical value above, would we conclude that the children’s intelligence is or is not affected if their mothers have German measles during pregnancy?
D. Do we reject or fail to reject (accept) the NULL hypothesis?
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