A researcher is interested in the relationship between caffeine intake and short-term memory. On each day over a period of a few weeks, the researcher randomly assigned a daily caffeine intake to each person and measured their performance on a short-term memory test. The resulting data had a correlation coefficient of −0.75. Can the researcher conclude that caffeine causes an decrease in short-term memory? Explain. (1 point)
Responses
No. The researcher did not control the caffeine intake, so the data only show correlation.
Yes. The researcher controlled the memory test scores, so the correlation in the results implies a cause-and-effect relationship.
Yes. The researcher controlled the caffeine intake, so the correlation implies causation.
No. The researcher did not control the memory test scores, so the data only show correlation.
1 answer
No. The researcher did not control the caffeine intake, so the data only show correlation.
1 answer