How Much Nicotine Is in Those Cigarettes?
A tobacco company claims that its best-selling cigarettes contain at most 40 mg of nicotine. This claim is tested at the 1% significance level by using the results of 15 randomly selected cigarettes. The
Sample mean = 42.6 | P-value = 0.008 |
Sample standard deviation = 3.7 | Significance level = 0.01 |
Sample size = 15 | Test statistic t = 2.72155 |
Degrees of freedom = 14 | Critical value t = 2.62449 |
1. What are the degrees of freedom?
2. Is this a z or t test?
3. Is this a comparison of one or two samples?
4. Is this a right-tailed, left-tailed, or two-tailed test?
5. From observing the P-value, what would you conclude?
6. By comparing the test statistic to the critical value, what would you conclude?
7. Is there a conflict in this output? Explain.
8. What has been proved in this study?
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