Question

In: Statistics and Probability

A study was conducted to assess the effects that occur when children are exposed to cocaine...

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.

Solutions

Expert Solution

Yes since 0 is not contained within the confidence​ interval, it appears that prenatal cocaine exposure is associated with lower scores.

orchestra answered 1 year ago
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