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 t mathematical competence." The 196 children born to cocaine users had a mean of 7.3 and a standard deviation of 3.0. The 199 children not exposed to cocaine had a mean score of 8.3 with a standard deviation of 2.9. Assume that 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. Complete b) below. a. Use a 0.01 significance level to test the claim that prenatal cocaine exposure is associated with lower scores of four-year-old children on the test of object assembly. Identify the null and alternative hypotheses. O A. Ho: H1 * P2 O B. Ho: H1 =P2 OC. Ho: 1 H2 H: H1 =2 O D. Ho: H1 =H2 H: H
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 t mathematical competence." The 196 children born to cocaine users had a mean of 7.3 and a standard deviation of 3.0. The 199 children not exposed to cocaine had a mean score of 8.3 with a standard deviation of 2.9. Assume that 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. Complete b) below. a. Use a 0.01 significance level to test the claim that prenatal cocaine exposure is associated with lower scores of four-year-old children on the test of object assembly. Identify the null and alternative hypotheses. O A. Ho: H1 * P2 O B. Ho: H1 =P2 OC. Ho: 1 H2 H: H1 =2 O D. Ho: H1 =H2 H: H
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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