ind a 87% confidence interval for the difference in scores depending on the prenatal cocaine exposure.
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A study was conducted on children exposed to prenatal cocaine. At age 6 Children were tested for object assembly skill, which was described as "a task requiring visual-spatial skills related to mathematical competence." The 252 children born to cocaine users had a mean of 15.4 and a standard deviation of 3.4. The 272 children not exposed to cocaine had a mean score of 7.4 with a standard deviation of 0.9
(The data are based on "Cognitive Outcomes of Preschool Children with Prenatal Cocaine Exposure," by Singer, et al., Journal of the American Medical Association, Vol. 291, No. 20)
Find a 87% confidence interval for the difference in scores depending on the prenatal cocaine exposure.
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