CPH Exam| 125 QUESTIONS| WITH COMPLETE SOLUTIONS

It is well recognized that one of the easiest ways to increase statistical power is to increase the sample size. Which of the following could also be used to increase power in a study. correct answer: Reduce error through using appropriate methods **Power is primarily influenced by two things, sample size and variability. Power increases as sample size increases or variability decreases. Variability includes two parts, true variability and error varibility. We collected 100 samples of size thirty of household income in Arkansas with population mean, mu=50 (in thousands). the sample mean, X and sample standard deviation, s, were recorded and the 95% confidence interval for mu was taken for each sample. Given the 100 confidence intervals, how many do you expect to cover the population mean mu=50? correct answer: 95 **A 95% confidence interval implies that were the estimation process repeated again and again, the 95% of the calculated intervals would be expected to contain the true parameter value mu=50. Randominzation, stratified analysis, and matching correct answer: minimize confounding Which of the following about the stage of change from the Transtheoretical Model is true correct answer: Action refers to behavior change for less than 6 months The best time to prepare an evaluation plan for a health intervention program is: correct answer: During the program planning period **An evaluation perspective when applied during planning can assure that the program intervention is specific enough to support rigorous evaluation A major obstacle to risk communication effectiveness is that most risks are derived from uncertainty, complexity, and incompleteness of environmental data. Which of the following are additional obstacles to risk communication? correct answer: The distrust felt by the general public due to disagreements among experts; lack of coordination among risk management organizations; inadequate training of experts and spokespersons in risk communication skills Jacobson v massachusetts brought to light that there are difficult tradeoffs between public and private interets awhich can extend to many areas of public health concern. What prominent and still current public health issue was the basis of this debate. correct answer: Compulsory vaccination The national consensus public health strategy of the government, public health organizations and citizens is known as: correct answer: Healthy People Which of the following intervention messages is most likely to have an impact on behavior? correct answer: Based on health education theory and tailored to the target audience Which of the following is not a method for controlling confounding by demographic variable like age in epidemiologic studies? correct answer: Blinding Which of the following questions should one ask to determine whether programs are evidence-based interventions? correct answer: What interventions have been scientifically proven to promote good health behaviors? A limitation to using hospital discharge data to assess community health problems is: correct answer: Data are only available for sicker people who are admitted to a hospital.