Imagine that a study has just been published which shows a relationship between a certain nutritional supplement and a lower incidence of cold and flu. This study was based on survey data and asked people to report whether or not they used this supplement in the last four months, as well as estimate the amount of times they were ill in that same period, and the average duration associated with those illnesses. Their results show that people who take the supplement report being ill less often and/or for less time. The company selling the supplement wants to claim that this is scientific proof their product works. What would the company need to do in order to support that claim?
A)collect a larger sample
B)collect a more diverse sample
C)conduct an experiment
D)use a double-blind procedure
E)replicate the results

Question

Quizplus · Accepted Answer

The company would need to conduct an experiment to establish a causal relationship, as survey data only shows correlation, not causation.

Imagine That a Study Has Just Been Published Which Shows