Use the standard deviation values ofthe two samples to find the standard deviation of the sample mean differences. Sample Standard Deviation red box 3.858 blue box 2.933 Then complete each statement. The sample size of the session regarding the number of people would purchase the red box, N1, is V . The sample size of the session regarding the number of people would purchase the blue box , N2, is ' . The standard deviation of the sample mean differences is approximately