Question

question 7. a medical researcher in investigating possible causes of a certain rate disease. she uses a questionnaire to collect a variety of data from 100 volunteers who have the disease. based on the results of the study, the researcher plans further research. which of these can be concluded? choose two correct answers. a. the study was based on self - reporting. b. the study has an observation design. c. the study was based on objective data collection. d. the study has an experimental design. e. the study was based on a random selection of participants.

Explanation:

• Option A: The researcher uses a questionnaire, so data is self - reported by volunteers. This is correct.
• Option B: The study is observing volunteers with the disease (collecting data from them without intervening experimentally), so it has an observational design. This is correct.
• Option C: Questionnaire data (self - reported) is not objective data collection (objective data would be like medical tests, measurements etc.). So this is incorrect.
• Option D: There's no mention of experimental manipulation (like giving treatments, changing variables), so it's not an experimental design. Incorrect.
• Option E: The participants are volunteers with the disease, not randomly selected (random selection would involve a more random process from a population, here it's volunteers with the disease). Incorrect.

Answer:

A. The study was based on self - reporting
B. The study has an observation design