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 A. What is the population standard deviation? B. What is the population standard error of the mean? C. On the frequency tables, what do the values in the left hand column for the Zscore(IQ) tell us?
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 |
A. What is the population standard deviation?
B. What is the population standard error of the mean?
C. On the frequency tables, what do the values in the left hand column for the Zscore(IQ) tell us?
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