Question: A study comparing birth weight to IQ found 252 subjects(sample 1) with extremely low birth weights had IQ scores at age 8 with a mean

A study comparing birth weight to IQ found 252 subjects(sample 1) with extremely low birth weights had IQ scores at age 8 with a mean of 94.2 and a standard deviation of 16.6. The control group of 274 subjects(sample 2) with normal birth weights had IQ scores with a mean of 97.7 and a standard deviation of 12.2 at age 8. Construct a95% confidence interval estimate of the difference between the mean IQs of the two groups. Do not assume the population standard deviations are equal. Does IQ score appear to be affected byweight?

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