A High Correlation Between Two Variables Does Not Always Mean

Multiple Choice

A high correlation between two variables does not always mean that changes in one cause changes in the other. The best way to get good evidence that cause-and-effect is present is to

A) select a simple random sample from the population of interest.
B) arrange the data in a two-way table.
C) carry out a randomized comparative experiment.
D) make a scatterplot and look for a strong association.
E) make a histogram and look for outliers.