In a survey of 2,500 U.S. adults, 68% responded that they were confident that "smart homes" will be as commonplace
as smartphones within 10 years. Indicate whether the study is an observational study or an experiment. Give a brief
explanation for your choice.
(a) This is an observational study because the researchers observed how many of the 2,500 adults have
smartphones.
(b) This is an observational study because the researchers recorded responses to questions on a survey. No
adults were assigned to different experimental groups.
(c) This is an experiment because the researchers conducted a survey. Adults were randomly selected for the
survey.
(d) This is an experiment because the adults were assigned to different experimental groups and then the
researchers recorded responses to questions on a survey.
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(b) This is an observational study because the researchers recorded responses to questions on a survey. No
adults were assigned to different experimental groups.
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