Since the critical value is still larger than the test statistic, we fail to reject the null hypothesis. Population 2 Sample Degrees of Freedomđ89 Population 1 Sample Degrees of Freedomđ85 ![]() Let σ12 be the population standard deviation of mothers who did not use cocaine during their pregnancies and σ22 be the population standard deviation of mothers who used cocaine during their pregnancies.ī) Perform the hypothesis test you set up in a) with the significance level = 0.05. This is a test for two population standard deviation/variance so I have used the F Test. ![]() We want to test whether the populations have the same standard deviation or not. Further, a random sample of the birth weights of 190 babies born to mothers who used cocaine during their pregnancies has a mean of 2700g and a standard deviation of 645g.Ī) Set up the null and alternative hypotheses to test the claim that both samples are from the populations having the same standard deviation. These babies were born to mothers who did not use cocaine during their pregnancies. ![]() A random sample of the birth weights of 186 babies has a mean of 3103g and a standard deviation of 696g (based on data from ``Cognitive Outcomes of Preschool Children with Prenatal Cocaine Exposure,'' by Singer et al., Journal of the American Medical Association, Vol. ![]() This content was COPIED from - View the original, and get the already-completed solution here! Not what you're looking for? Search our solutions OR ask your own Custom question.
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