Question

A health care provider wants to rate its members' satisfaction with physical therapy. A questionnaire is mailed to 800 members of the health plan selected at random from the list of members who were prescribed physical therapy in the past 12 months. Only 212 questionnaires are returned. (a) What is the intended population in this study? Be careful: What group does the health care provider want information about? O the 212 members who returned the questionnaire O all members who received physical therapy in the past 12 months O all of the health care provider's members O the 800 members who were randomly selected (b) What is the sample? Be careful: From what group does the provider actually obtain information? O the 212 members who returned the questionnaire 0 the 800 members who were randomly selected O all members who have received physical therapy O all members who received physical therapy in the past 12 months

Answer 1

Answer

(1) Population is always the bigger set from which we select the smaller sets, i.e. from which we select sample sizes. In this case, it is clear that the sample is the set of 212 members who retuned the questionnaire. So, we can say that the population in this case is the set of all people who received physical therapy in the past 12 months.

So, option B is correct answer

(2) Sample is always sub-part or subset of population, i.e. sample is always a group of some selected items from the population. In this case, population is set of all people who received physical therapy in the past 12 months. So, sample would be the set or group of 212 members who retuned the questionnaire

So, option A is correct answer