Researchers selected a simple random sample of 100 children to takea test to det

Question

Researchers selected a simple random sample of 100 children to takea test to determine their IQs. The sample results were
103.5
X= with a standard deviation of s = 20.0. AverageIQ is 100. The researcher would like to determine if thepopulation
from which the sample was selected has an IQ that is significantlyhigher than average.

The P-value is
(a) Less than 1%     (b)4%     (c) 8%     (d)43%    (e) None of these

A 95% confidence interval for the mean IQ of all the children has amargin of error of
(a) 0.4     (b) 3.3     (c)3.9     (d) 5.2     (e)39.2  

Explanation / Answer

8%, 3.9

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