Assignment:
Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal.
Car Fuel Consumption Ratings Listed below are combined city-highway fuel consumption ratings (in miles gal) for different cars measured under both the old rating system and a new rating system introduced in 2008 (based on data from USA Today). The new ratings were implemented in response to complaints that the old ratings were too high. Use a 0.01 significance level to test the claim the old ratings are higher than the new ratings.
|
Old rating
|
16
|
18
|
27
|
17
|
33
|
28
|
33
|
18
|
24
|
19
|
18
|
27
|
22
|
18
|
20
|
29
|
19
|
27
|
20
|
21
|
|
New rating
|
15
|
16
|
24
|
15
|
29
|
25
|
29
|
16
|
22
|
17
|
16
|
24
|
20
|
16
|
18
|
26
|
17
|
25
|
18
|
19
|