What Is the Best Way to Determine Whether or Not

Multiple Choice

What is the best way to determine whether or not there is a statistically significant linear relationship between two quantitative variables?

A) Compute a regression line from a sample and see if the sample slope is 0.
B) Compute the correlation coefficient and see if it is greater than 0.5 or less than -0.5.
C) Conduct a test of the null hypothesis that the population slope is 0.
D) Conduct a test of the null hypothesis that the population intercept is 0.