.For which of the following situations would a person be more willing to pay to reduce their risk?

A. when the risk is reduced from 50% to 40%

B. when the risk is reduced from 10% to 0%

C. when the risk is reduced from 100% to 90%

D. when the risk is reduced from 90% to 80%

If P(A) = 0.45 and P(B) = 0.50 and P(A and B) = 0.10, what is the probability of P(A or B) if A and B are two mutually exclusive events from an experiment?

A. 0.85

B. 0.95

C. 0.05

D. 0.225

For which of the following situations would a confidence interval analysis be most appropriate?

A. A researcher is interested in whether patients have better results with a new treatment as compared to a placebo.

B. A researcher is interest in the average number of miles a person drives to work daily.

C. A researcher is interested in whether individuals lost weight or stayed the same when using a new diet regime

D. A researcher is interested in whether there is a difference in the proportion of children that attend preschool prior to kindergarten for boys and girls.