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 2 years agoRelated Solutions
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 196 children born to cocaine users had a mean of
7.4 and a standard deviation of 2.9. The 183 children not exposed
to cocaine had a mean score of 8.3 with a standard deviation of
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help another child (apparently) in distress. Twenty-four
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Students in the IR group were informed that another child was alone
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A study by Staub, 1970, was concerned with the effects of instructions to young children and...
A study by Staub, 1970, was concerned with the effects of
instructions to young children and their subsequent attempts to
help another child (apparently) in distress. Twenty-four
first-grade students were randomly assigned to one of three groups.
The first group was labeled as indirect responsibility (IR).
Students in the IR group were informed that another child was alone
in an adjoining room and had been warned not to climb up on a
chair. The second group was labeled direct responsibility...
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