1. If a Chi-square analysis shows a significant interaction of rows and columns for a 2 x 2 contingency table, which of the following is true?

a. You will need to apply the Holm procedure.

b. The 95% confidence interval for the odds ratio will not overlap with 0.

c. The 95% confidence interval for the odds ratio will not overlap with 1.

d. You will definitely be able to compute a relative risk.

2. A 95% confidence interval for a Relative Risk goes from 0.5 to 0.8, where numbers less than 1 favor the treatment. What is the correct interpretation?

a. The relative risk shows a significant benefit of control.

b. The relative risk shows an insignificant benefit of treatment.

c. The relative risk shows an insignificant benefit of control.

d. The relative risk shows a significant benefit of treatment.

3. A confidence interval for a difference in means has what degrees of freedom?

a. n₁ - n₂ - 2

b. n₁ + n₂ - 2

c. (n₁ + n₂) / 2

d. n₁ + n₂ + 2