Question

Hello, please answer with either formula or preferably with TI-84 ONLY. (No r studio, etc) thanks!

For problems #13 to #18, test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, then state the conclusion about the null hypothesis, and final conclusion that addresses the original claim.If you are using graphing calculators, show all commands.

18. 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 describe as “atask requiring visual-spatial skills related to mathematical competence.” The 190 children born to cocaine users had a mean score of 7.3 and a standard deviation of 3.0. The 186 children not exposed to cocaine had a mean score of 8.2 with a standard deviation of 3.0. Use a 0.01significance level to test the claim thatprenatal cocaine exposure is associated with lower scores. Assume that the samples are selected from normally distributed populations and assume that the population standard deviations are not equal.

??:

??:

Test Statistic:

P-value =

Reject ??. OR Fail to reject ??. (Circle one)

Final Conclusion:

Answer 1

STAT --> TESTS --> 2-SampTTest --> Stats

Test Statistic: -2.908

P-value = 0.0019

Reject ??. (since P-value < 0.01)

Final Conclusion: There is sufficient evidence to conclude that prenatal cocaine exposure is associated with lower scores.