Stew’s Cars operates 3 dealerships in three regions. The GeneralManager, Lynn, questioned whether the company’s mean profit marginper vehicle sold differed by region.
Steps
1. Specify population parameter of interest and state the null& alt hypotheses
- H0:
Ha:
- H0:
Ha:
2. State level of significance & decision rule
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3. Select random samples from each population
4. Test hypotheses - Use Excel’s Data Analysis Tool.
Step5.1Â Â Â Â Â Â Â Â Â Â Â Decision (Reject Ho vs Do not Reject Ho):Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
                                                                                                          Â
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Step 5.2: Write up the conclusion and implication (use thecomplete sentence):
| West | Southwest | Northwest | |
| 3700 | 3300 | 2900 | |
| 2900 | 2100 | 4300 | |
| 4100 | 2600 | 5200 | |
| 4900 | 2100 | 3300 | |
| 4900 | 3600 | 3600 | |
| 5300 | 2700 | 3300 | |
| 2200 | 4500 | 3700 | |
| 3700 | 2400 | 2400 | |
| 4800 | | 4400 | |
| 3000 | | 3300 | |
| | 4400 | |
| | 3200 | |
