|
Title: If we are testing for the difference between the means of 2 independent populations presuming equal ... Post by: devv_ann on Mar 10, 2018 If we are testing for the difference between the means of 2 independent populations presuming equal variances with samples of n1 = 20 and n2 = 20, the number of degrees of freedom is equal to
A) 19. B) 18. C) 38. D) 39. Q. 2 The t test for the difference between the means of 2 independent populations assumes that the respective A) sample variances are equal. B) sample sizes are equal. C) populations are approximately normal. D) All of the above. Q. 3 True or False: When the sample sizes are equal, the pooled variance of the two groups is the average of the 2 sample variances. Indicate whether the statement is true or false Q. 4 True or False: For all two-sample tests, the sample sizes must be equal in the two groups. Indicate whether the statement is true or false Q. 5 The marketing manager for an automobile manufacturer is interested in determining the proportion of new compact-car owners who would have purchased a knee airbag if it had been available for an additional cost of 300. The manager believes from previous information that the proportion is 0.30. Suppose that a survey of 200 new compact-car owners is selected and 79 indicate that they would have purchased the knee airbag. If you were to conduct a test to determine whether there is evidence that the proportion is different from 0.30 and decided not to reject the null hypothesis, what conclusion could you reach? A) There is not sufficient evidence that the proportion is not 0.30. B) There is sufficient evidence that the proportion is not 0.30. C) There is not sufficient evidence that the proportion is 0.30. D) There is sufficient evidence that the proportion is 0.30. Title: If we are testing for the difference between the means of 2 independent populations presuming equal ... Post by: govthst39 on Mar 10, 2018 Content hidden
Title: If we are testing for the difference between the means of 2 independent populations presuming equal ... Post by: devv_ann on Mar 10, 2018 I'd be lost without this website, honestly
|