Question

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
15	24	25	23
25	24	13	19
18	23	16	20
19	15	19	19
24	18	13	15
23	19	18	22
18	18	22	18
13	21	17	15
12	15	17	23
15	18	20	18
24	24	20	14
17	16	12	19
16	21	23	23
19	21	12	20
14	12	13	12
23	19	22	22
18	18	17	22
23	16	12	16
12	13	18	18
16	23	20	25

b-1. Calculate the value of the test statistic. Assume that σ_A² = 4.7 and σ_B² = 5.5. (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.

Answer 1

we have ve Lrond A Brand B n 40 hremahons for each Biünd A f Brdnd 3-825 40