Twenty different statistics students are randomly selected. for each of them, their body temperature ( degrees °c) is measured and their head circumference (cm) is measured. if it is found that r=0, does that indicate that there is no association between these two variables?
An r-value, or correlation coefficient, goes from -1 to positive 1. -1 indicates a perfect decreasing match and 1 indicates a perfect increasing match. 0 indicates no relationship between the variables.
