Question: Please help me figure this out. I don't know how to find the degree of freedom. Learning the Mechanics 9.6 In order to compare the

Please help me figure this out. I don't know how to find the degree of freedom.

Learning the Mechanics 9.6 In order to compare the means of two populations, inde- NW pendent random samples of 400 observations are selected from each population, with the following results: Sample 1 Sample 2 x1 = 5,275 X2 = 5,240 S1 = 150 $2 = 200 a. Use a 95% confidence interval to estimate the dif- ference between the population means (M1 - M2). Interpret the confidence interval. 9

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