Question

The table and scatter plot below show the price and overall quality rating for 15 different brands of bike helmets.Do you think that there is a statistical relationship between price and quality rating? If so, describe the nature of the relationship.

Answer 1

This refers to the correlation between two variables.

In a dot plot, you can guess what kind of relationship exists between both variables.

In this case, for big values of x correspond to small and big values of y, the same happens to small values of x. The dots form a uniform cloud, so you can expect that there will be no statistical relationship between the variables (no correlation)