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Investigation 3

# Investigation 3 - Vanessa Reapor Statistics 252 Section 07...

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Vanessa Reapor Statistics 252, Section 07 January 19, 2010 Investigation 3: Nicotine Lozenge A) Experimental because researchers randomly assigned smokers to one of two groups. B) Observational Units: Smokers. Explanatory Variable: The type of lozenges the smoker took (nicotine/placebo). Response Variable: Whether or not the person quit smoking. C) H 0: π nicotine = π placebo H A: π nicotine π placebo α= .05 Test Statistic: .84 P-Value: .399 Fail to Reject the H 0 (.399 > .05) Conclusion: Extremely strong evidence that there is no difference between nicotine and placebo medicine. Test and CI for Two Proportions Sample X N Sample p 1 197 459 0.429194 2 184 458 0.401747 Difference = p (1) - p (2) Estimate for difference: 0.0274472 95% CI for difference: (-0.0363199, 0.0912142) Test for difference = 0 (vs not = 0): Z = 0.84 P-Value = 0.399 Fisher's exact test: P-Value = 0.422 D) Researchers would be glad for the null hypothesis not to be rejected because it proves people can abstain from smoking. E) H 0: π nicotine = π placebo H A: π nicotine > π placebo α= .01 Test Statistic: 3.63 P-Value: .000 Rejct H 0 (.000 < .01) Conclusion: Moderately strong evidence that smokers who used the nicotine lozenges were more effective compared to the placebo lozenges.

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Investigation 3 - Vanessa Reapor Statistics 252 Section 07...

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