Question 1 4 points Save TABLE 10-4. A real estate company is interested in test

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Question 1 4 points   Save   TABLE 10-4. A real estate company is interested in testing whether, on average, families in Gotham have been living in their current homes for less time than families in Metropolis have. Assume that the two population variances are equal. A random sample of 100 families from Gotham and a random sample of 150 families in Metropolis yield the data on length of residence in current homes. Referring to Table 10-4, what is(are) the critical value(s) of the relevant hypothesis test if the level of significance is 0.01?
t . Z = - 1.96 t . Z = A real estate company is interested in testing whether, on average, families in Gotham have been living in their current homes for less time than families in Metropolis have. Assume that the two population variances are equal. A random sample of 100 families from Gotham and a random sample of 150 families in Metropolis yield the data on length of residence in current homes. Referring to Table 10-4, what is(are) the critical value(s) of the relevant hypothesis test if the level of significance is 0.01? To test the effectiveness of a business school preparation course, 8 students took a general business test before and after the course. Referring to Table 10-5, the number of degrees of freedom is When testing for the difference between 2 population variances with sample sizes of = 8 and = 10, the number of degrees of freedom are Referring to Table 10-2, the researcher was attempting to show statistically that the female MBA graduates (Population 1 Sample) have a significantly lower mean starting salary than the male MBA graduates. From the analysis in Table 10-2, the correct test statistic is: A real estate company is interested in testing whether, on average, families in Gotham have been living in their current homes for less time than families in Metropolis have. Assume that the two population variances are equal. A random sample of 100 families from Gotham and a random sample of 150 families in Metropolis yield the data on length of residence in current homes. Referring to Table 10-4, what is(are) the critical value(s) of the relevant hypothesis test if the level of significance is 0.05? Given the following information, calculate the degrees of freedom that should be used in the pooled-variance t test: s12 = 4 and n1 = 16 s22 = 6 and n2 = 25 Are Japanese managers more motivated than American managers? A randomly selected group of each were administered the Sarnoff Survey of Attitudes Toward Life (SSATL), which measures motivation for upward mobility. Referring to TABLE 10-1, judging from the way the data were collected, which test would likely be most appropriate to employ? In testing for the differences between the means of two (2) independent populations where the variances in each population are unknown but assumed equal, the degrees of freedom are If we are testing for the difference between the means of two (2) independent populations with samples n1 = 20 and n2= 20, the number of degrees of freedom is equal to The use of preservatives by food processors has become a controversial issue. Suppose 2 preservatives are extensively tested and determined safe for use in meats. A processor wants to compare the preservatives for their effects on retarding spoilage. Suppose 15 cuts of fresh meat are treated with preservative A and 15 are treated with preservative B, and the number of hours until spoilage begins is recorded for each of the 30 cuts of meat. Referring to Table 10-3, what assumptions are necessary for a comparison of the population variances to be valid?

Explanation / Answer

1)d t . Z = - 2.33

2)d 7.

3)c 18

4)b - 1.4019

5)a t . Z = - 1.645

6)b df = 39

7)Pooled-variance t test for the difference between two means

8)c n1 + n2 - 2

9)19.

10)b Both samples are random and independent.

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