Answer Happy

Question 19 (1 point) Which of the following is true regarding selection bias? a) A p-value below 0.05 means that selection bias is not a major concern. b) Selection bias does not depend on sample size. c) Increasing the sample size will help to reduce selection bias. d) Selection bias is not a concern in descriptive studies. Question 20 (1 point) In the case of a cross over trial, each of the following is true except: a) A period of washout may be required between trial stages. b) They can be difficult to undertake in circumstances where a treatment has long-term effects. c) Groups such as communities or towns cannot be treatment units. d) Smaller sample sizes may be adequate.