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” and their test scores were recorded. Assume that test scores in both populations are normally distributed. The data are summarized as follows: Children not exposed to prenatal cocaine use: n1 = 10, x¯1 = 8.2, s1 = 3.0 Children born to prenatal cocaine users: n2 = 12, x¯2 = 7.3, s2 = 3.0 At 5% significance test the claim that prenatal cocaine exposure is associated with lower scores of four-year-old children on the test of object assembly. FIND: Hypothesis Test statistic
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” and their test scores were recorded. Assume that test scores in both populations are
At 5% significance test the claim that prenatal cocaine exposure is associated with lower scores of four-year-old children on the test of object assembly.
FIND:
Hypothesis
Test statistic
DF
Test Equality of an unknown population variances
Critical values
Interpret data and find p-value test
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