pls help me
xiao123A consumer advocate researches the length of life between two brands of refrigerators, Brand A and Brand B. He collects data on the longevity of 40 refrigerators for Brand A and repeats the sampling for Brand B. These data are measured in years and can be found on the text website, labeled Refrigerator Longevity. Let Brands A and B represent populations 1 and 2, respectively. Use Table 1. |
| Brand A | Brand B | Brand A | Brand B |
| 25 | 21 | 18 | 19 |
| 15 | 15 | 24 | 19 |
| 24 | 15 | 17 | 17 |
| 24 | 19 | 18 | 22 |
| 12 | 24 | 19 | 19 |
| 25 | 19 | 18 | 25 |
| 20 | 21 | 23 | 22 |
| 19 | 19 | 12 | 15 |
| 24 | 19 | 24 | 15 |
| 12 | 15 | 18 | 24 |
| 18 | 20 | 25 | 15 |
| 19 | 23 | 17 | 12 |
| 15 | 19 | 14 | 23 |
| 14 | 13 | 13 | 25 |
| 14 | 17 | 16 | 21 |
| 22 | 14 | 21 | 23 |
| 12 | 17 | 13 | 24 |
| 21 | 17 | 20 | 16 |
| 13 | 14 | 20 | 13 |
| 19 | 16 | 20 | 25 |
Click here for the Excel Data File
| a. | Specify the competing hypotheses to test whether the average length of life differs between the two brands. | ||||||
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| b. | Using the appropriate commands in Excel, find the value of the test statistic. Assume that σA2 = 4.6 and σB2 = 5.3. What is the p-value? (Negative values should be indicated by a minus sign. Do not round intermediate calculations. Round "test statistic" value to 2 decimal places and "p-value" to 4 decimal places.) |
| Test statistic | [removed] |
| p-value | [removed] |
| c. | At the 5% significance level, what is the conclusion? | ||||||||
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12 years ago
5
