2. Notation for comparing two populations

PLEASE HELP ME WITH THE ANSWERS WITH SAMPLE 1 AND SAMPLE 2 :) BELOW I THINK THEY ARE NOT CORRECT

In a study, professor Michael LaCour-Little selected independent random samples of mortgages that were refinanced and mortgages that were not refinanced. (Source: Michael LaCour-Little, "Another Look at the Role of Borrower Characteristics in Predicting Mortgage Prepayments," Journal of Housing Research 10, no. 1 (1999): 45-59.) Of the 686 refinanced mortgages, the mean mortgage rate was 8.62 with a sample standard deviation of 0.37. Of the 686 mortgages that were not refinanced, the mean mortgage rate was 8.09 with a sample standard deviation of 0.66.

Suppose you intend to conduct a hypothesis test on the difference in population means. In preparation, you identify the sample of mortgages that were refinanced as sample 1 and the sample of mortgages that were not refinanced as sample 2. Organize the provided data by completing the following table:

Sample 1

N1= 686

?1= not provided/unknown

X1= 8.62

?1= not provided/unknown

s1= 0.37

Sample 2

N2= 686

?2= not provided/unknown

X2= 8.09

?2= not provided/unknown

s2= 0.66

The difference in sample means for sample 1 and sample 2 is______ PLEASE HELP CHOICES ARE 0.29, 0, 0.53, -0.53.

The estimate of the standard deviation of the sampling distribution of the differences in sample means,s(X?X) , isCHOICES: 0.37, 0.029, 0.039, 0.53.

Now, you know all that you need to know to answer the question about whether the mortgage rate of refinanced mortgages is different from the mortgage rate of mortgages that were not refinanced.

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