Discussion:
Q: A Tire Company must determine which of four tire brands supplies the most amount of tire wear. It has been decided that all four tires are to be placed on each of eight cars. This design should allow us to compare tires without having differences in cars affect the comparison. Determine whether there is differences among the four tire brands. If there are differences define exactly which tires are the same and which are different Use the six-step approach to analyze this data. Explain what test to use.
1. State the hypothesis
2. Specify a(Alpha) = 0.05
3. Define the test statistic
4. Define reject region
5. Calculate test statistic
6. Determine reject or not reject and explain why.
| Car |
Michelin |
Uniroyal |
Bridgestone |
Dunlop |
| 1 |
33 |
34 |
34 |
28 |
| 2 |
28 |
29 |
30 |
25 |
| 3 |
25 |
22 |
31 |
21 |
| 4 |
30 |
24 |
36 |
22 |
| 5 |
31 |
36 |
24 |
24 |
| 6 |
26 |
29 |
23 |
26 |
| 7 |
28 |
25 |
37 |
33 |
| 8 |
32 |
28 |
31 |
26 |