In: Statistics and Probability
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 191children born to cocaine users had a mean of 7.3 and a standard deviation of 3.1.The 182 children not exposed to cocaine had a mean score of 8.3 with a standard deviation of 2.9. 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.
What is the test statistic?
What is the P value?
Test the claim by using a confidence interval:
The ____% confidence interval estimate is ____ <µ1 - µ2<____
Based on the confidence interval, is prenatal cocaine exposure associated with lower scores of four-year-old children on the test of object assembly?
(Yes/No) since __ (is/is not) contained within the confidence interval, it (appears/ does not appear) that prenatal cocaine exposure is associated with lower scores.
Yes since 0 is not contained within the confidence interval, it appears that prenatal cocaine exposure is associated with lower scores.