Question

1. Describe: a) a control subject in a case-control study, 2. and b) a control subject in an experiment. You may want to describe their disease and/or exposure status. 3. Does "validity" indicate that a test or an instrument is accurate/correct? a. Yes b. No 4. The Healthy Worker Effect is an epidemiological concept that has shown that as a group, people who are employed are healthier than the general population. Because of this researchers must be alert to the possibility of sectional studies. bias when using a worksite sample, especially in cross- c. testing a. instrumentation b. selection 5. An example of bias is comparing the SAT scores of students from a private academy with the SAT scores of students from a public high school, and concluding that the private school is the better school. History Testing Instrumentation d. Maturation Regression toward the mean Attrition a. b. e. c. f. Selection g. An example of a(n) have a specific disease. No comparison group is used in this study. This is a weak study design. 6. study would be describing the health habits of 200 people who b. case-control a. case-series c. cohort d. experiment 7. A study measured the effects of an exercise program on aerobic fitness. The first data collection used results from a stationary bicycle test, but after the intervention a treadmill running test was used. What type of bias might be introduced using this methodology? History Testing Instrumentation d. Maturation a. Regression toward the mean Attrition b. e. c. Selection g. 8. As an epidemiologist, if you were given a choice, would you rather have a test that is designed to identify the presence or non presence of a disease to be valid or reliable? a. Valid b. Reliable

Answer 1

PAGE NO DATE: 1 Ans 1 (a) Control who is does not and who Conditions Subject is free from represent are under of the the subject a disease and a the Symptoms & Controlled Researcher Ansa(b) In group any any experiment on the Contool to or subject the effect of a exporiment is to be evaluated. - Ansya (a) yes Validity indicate that a. 1 teet or instrument is accurate or Correct validity is the measurement of accuracy. - Anss 4. (b) In the given statement there are two different groups are is employer and other is general Population so it will help the researcher in Selection of Sample or groups.