In a test of the effectiveness of a device that is supposed to increase gasoline mileage in automobiles, a sample of cars were run, in random order, over a prescribed course both with and without the device in random order. The mileages (mpg) are given below. Is there evidence that the device is effective?

1. What is/are the population(s) of interest? Think carefully and be as specific as possible!

2. What are the research and null hypotheses?

3. What is/are the sample(s)?

4. What is the comparison distribution a distribution of?

5. What are the properties of the comparison distribution?

6. What is/are the critical value(s) of the test?

7. What is the value of the test statistic?

8. What conclusion should the researcher draw?

9. Estimate the p value of the test. You will need to state a range.

Transcribed Image Text:

Car number 1 2 3 4 5 Mileage with device 21.0 29.7 24.6 25.2 29.9 Mileage without device 22 28.7 23.6 26.2 28.9 Car number 1 2 3 4 5 Mileage with device 21.0 29.7 24.6 25.2 29.9 Mileage without device 22 28.7 23.6 26.2 28.9

Answer rating: 100% (QA)

1 The population of interest The population of interest in this study is automobiles equipped with the device that is supposed to increase gasoline mileage This includes all types of automobiles that ... View the full answer