determine whether the study is an experiment ...
determine whether the study is an experiment or an observational study, and then identify a major problem with the study. in a survey, 1465 internet users chose to respond to this question posted on a newspapers electronic edition: is news online as satisfying as print and tv news? 52% of the respondents said yes. this is an observational study because the researchers do not attempt to modify the individuals. what is a major problem with the study? a. there is no blinding or replication, which has a high chance of leading to bias. b. the sample is not very large. c. this is a convenience sample with voluntary response, which has a high chance of leading to bias. d. the results apply only to internet users.
Answer
# Brief Explanations:
这是一项观察性研究，因为研究者未试图改变个体。该研究的主要问题是它是一个便利样本且为自愿回应，这很可能导致偏差。自愿回应的样本可能只包含那些有强烈观点或有空闲时间回应的人，不能代表总体。
# Answer:
C. This is a convenience sample with voluntary response, which has a high chance of leading to bias.