A medical researcher wants to determine whether exercising can lower blood press
ID: 3355285 • Letter: A
Question
A medical researcher wants to determine whether exercising can lower blood pressure. At a health fair, he measures the blood pressure of 100 individuals, and interviewsthemabouttheirexercisehabits.Hedivides the individuals into two categories: those whose typical level of exercise is low, and those whose level of exercise is high. a. Isthisacontrolledexperimentoranobservational study? b. Thesubjectsinthelowexercisegrouphadconsiderably higher blood pressure, on the average, than subjectsinthehighexercisegroup.Theresearcher concludes that exercise decreases blood pressure. Is this conclusion well-justied? Explain
Explanation / Answer
(a) this is an observational study , the researcher doesn’t have any control over the variables, only interviewed them , wheteas in experimental study , the researcher divides the variables under study into two groups ( contro and treatment) and applies treatment over them and records the results.
(b) conclusion on the based of sample results is not justified, the researcher need to do hypothesis testing based on the sample data and then come to the conclusion about the significant effect of exercise on blood pressure