Marijuana and Chronic Obstructive Pulmonary Disease

/in /by

Scenario 8:
Marijuana is the second most commonly smoked substance next to tobacco worldwide. With the recent legalization of marijuana in Colorado, a study was done to examine the relationships between chronic obstructive pulmonary disease (COPD) and smoking marijuana. Six hundred cases of males between the ages of 18 and 29 that reported to have smoked marijuana on their routinely on health physical examinations were cross matched for COPD. Six hundred age matched males were used as controls. The data are summarized in Table 3 below.
Table 3. Marijuana and Chronic Obstructive Pulmonary Disease

Develop chronic obstructive pulmonary disease (COPD)Do not Develop chronic obstructive pulmonary disease (COPD)Total
Smokes only Marijuana81519600
Non smoker58542600
  • What is the null hypothesis equation for this experiment?
    Answer: _______________
  • What statistical test would you use?

A     z-test

B     ANOVA

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C     Relative Risk

D     Odds ratio

Answer: _______________

  • Based on the statistical test you chose, do you accept or reject the null hypothesis at P=0.05? Please paste your data output file in the area below.Answer: _______________
  • What is the 95% confidence interval for this experiment?
    Answer: _______________
  • What is the expected proportion of controls for this experiment? Round to the thousandths place.
    Answer: _______________
  • What is the power of this experiment? Please paste your data output file in the area below.
    Answer: _______________

Assuming that the expected odds ratio and expected proportion in unexposed controls remained the same, how many samples are needed to achieve a power level of 0.80? Please paste your data output file in the area below.

Answer: _______________