b-1. Calculate the value of the test statistic. Assume that o? = 4.9 and ag? = 5.9. (Negative values should be indicated by a minus sign. Round intermediate calculations to at least 4 decimal places...

Extracted text: b-1. Calculate the value of the test statistic. Assume that o? = 4.9 and ag? = 5.9. (Negative values should be indicated by a minus sign. Round intermediate calculations to at least 4 decimal places and final answer to 2 decimal places.) Test statistic


Extracted text: A consumer advocate researches the length of life between two brands of refrigerators, Brand A and Brand B. He collects data (measured in years) on the longevity of 40 refrigerators for Brand A and repeats the sampling for Brand B. These data are measured in years. (You may find it useful to reference the appropriate table: z table or t table) Brand A Brand B Brand A Brand B 13 22 19 12 24 15 12 25 18 25 25 24 15 14 24 12 17 20 17 25 25 25 20 23 12 15 14 24 12 16 20 12 20 16 21 23 18 13 17 22 17 24 20 23 13 15 19 17 16 16 15 13 17 24 14 17 25 20 25 25 12 20 15 23 16 18 18 13 24 22 18 13 17 20 24 20 15 18 12 22