[Steps Shown] A medical doctor sensed that smokers in the 40-49 age group with chronic lung disease had smoked on average more than 20 years. A sample of 12
Question: A medical doctor sensed that smokers in the 40-49 age group with chronic lung disease had smoked on average more than 20 years. A sample of 12 of these patients gives the respective years each patient had smoked:
| 21.9 |
| 21.3 |
| 19.6 |
| 21.4 |
| 24 |
| 25.9 |
| 25.5 |
| 25.1 |
| 20.6 |
| 17.9 |
| 18.2 |
| 24.1 |
- Using an alpha = .01 level of significance is there sufficient evidence to justify the doctor's belief?
- Also compute the 95 % confidence interval and see if these results agree with hypothesis test results. Explain
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