A study was conducted to assess the effects that occur when children are exposed to cocaine before birth. Children were tested at age 4 for object assembly skill, which was described as "a task requiring visual-spatial skills related to mathematical competence." The 182 children born to cocaine users had a mean of 7.4 and a standard deviation of 2.9. The 181 children not exposed to cocaine had a mean score of 8.3 with a standard deviation of 3.1. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Let population 1 be children born to cocaine users. The test statistic is The P-value is Test the claim in part (a) by using a confidence interval. The ________% confidence interval estimate is ____<μ1−μ2< ____.
A study was conducted to assess the effects that occur when children are exposed to cocaine before birth. Children were tested at age 4 for object assembly skill, which was described as "a task requiring visual-spatial skills related to mathematical competence." The 182 children born to cocaine users had a mean of 7.4 and a standard deviation of 2.9. The 181 children not exposed to cocaine had a mean score of 8.3 with a standard deviation of 3.1. Assume that the two samples are independent simple random samples selected from
The test statistic is
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