This is a bio statistics class, please help with this question.

Bio statistics True/False Multiple Choice 1. True or False? An active-control trial is the best option for researchers hoping to test a newly devised 1. The minimization of bias and confounding in clinical trials is obtained through the use of which of the therapy for a life-threatening illness among individuals with the illness, when a previously devised following? treatment is available for the illness A) Screening of study participants during recruitment to eliminate variation among participants B) The establishment of stringent inclusion criteria ensuring participants that are all similar C) The elimination of variation through the establishment of detailed exclusion criteria D) Randomization of study participants to make groups comparable in all respects 2. True or False? The application of treatment among participants in an experimental study is a key difference between an experimental study and an observational study. 2. A researcher is interested in determining the current prevalence of rheumatoid arthritis in the United the United States? States. Which type of study would be most useful in estimating the prevalence of rheumatoid arthritis in 3. True or False? Intention-to-treat analysis for a study is only conducted among individuals who fully A) A nested cohort study complied with a study's protocols. B) A cross-sectional survey C) A randomized clinical trial D) A case-crossover study 4. True or False? Extremely rare side effects of medications studied in clinical trials are more likely to be observed in cohort studies conducted during post marketing-surveillance because of the limited number of participants in clinical trials. 3. A number of patients have been admitted to a particular hospital with similar symptoms and the cause 5. True or False? The wash-out period is included in a crossover trial so that any therapeutic effects of the illness? of the illness is unknown. Which type of study design would be most helpful in determining the cause of the first treatment are removed, prior to the administration of the second treatment. A) A randomized trial B) A case series C) A retrospective cohort D) A case-control study 4. Misclassification bias is most likely to be observed in which study type? A) A randomized control trial B) A cross-sectional survey C) A prospective cohort D) A case-control study 5. A novice researcher noted that during summertime there is a positive association between the increase in ice cream sales and the increase in the number of drownings; however, there is no logical explanation for why ice cream sales would be responsible for the increased incidence of drowning. What phenomenon likely explains this type of observation? A) Placebo effect B) Concurrency `) Confounding D) Misclassification Bias