A consumer advocate researches the length of life between two brands of refrigerators, Brand A and Brand B. The accompanying data file shows the longevity of 40 refrigerators for Brand A and the longevity of 40 refrigerators for Brand B (Brand A and Brand B, respectively, both measured in years). Click here for the Excel Data File Assume that is the mean longevity for Brand A and 2 is the mean longevity for Brand B. a. Specify the competing hypotheses to test whether the average length of life differs between the two brands. Ho 0, versus Ha b-1. Calculate the value of the test statistic. Assume that the population variances are equal. Note: Negative value should be indicated by a minus sign. Round your answer to 4 decimal places. Test statistic Brand A Brand, B 15 24 14 20 14 13 25 23 17 14 20 17 22 12 13 13 14 13 16 22 16 12 15 24 25 24 22 23 16 21 22 24 12 12 15 24 21 19 23 21 14 19 14. 15 19 21 24 23 17 22 23 16 22 15 25 16 17 13 19 24 12 25 12 25 12 20 14 13 16 16 16 21 14 19 15 24 22 22 24 14 Test statistic b-2. Find the p-value. p-value 0.10 0.05 s p-value