Study A. A researcher randomly divided 500 adults into two groups. The first gro

Question

Study A. A researcher randomly divided 500 adults into two groups. The first group was told not to go to the dentist for regular cleanings. The second group was told to go to the dentist for regular cleanings at least 2 times each year. At the end of 5 years, the gum health of each participant in each group was measured. It was found that the group that received times each year had significantly better gum health. dental cleanings at least two Study B. A researcher gathered 500 adults randomly and asked them how often they went for regular dental cleanings each year and then measured their gum health. It was found that the adults who received dental cleanings at least two times each year had significantly better gum health. 1) Which study was experimental? How do you know? 2) Which study was observational? How do you know? 3) List the explanatory and response variable for each study

Explanation / Answer

1. Study A was experimental as proper procedure was followed in order to draw the conclusions.

2. Study B was observational as the participants were just observed on the basis of their day to day living.

3. The response variable is the focus of a questiom in a study and explanatory variable explains changes in that variable.. Regular checkup or cleaning is the expalnatory variable.. Gum Health is the response varuable

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