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 following data on length of residence in current homes.

-Referring to Table 10-4, what is a point estimate for the mean of the sampling distribution of the difference between the 2 sample means?
A) -22
B) -10
C) -15
D) 0

Question

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 following data on length of residence in current homes.
 
-Referring to Table 10-4, what is a point estimate for the mean of the sampling distribution of the difference between the 2 sample means?
A) -22 
B) -10 
C) -15 
D) 0

Quizplus · Accepted Answer

The point estimate for the mean of the sampling distribution of the difference between the 2 sample means is calculated as (x1-x2), which in this case is (18.4-33.2) = -14.8 (rounded to -15). Therefore, the best choice is C.

TABLE 10-4 a Real Estate Company Is Interested in Testing Whether, on Whether