## Correlation and Chi-square Tests for Independence

The word “correlate” has several meanings, e.g. “If two or more facts, numbers, etc. correlate or are correlated, there is a relationship between them” (Cambridge Dictionary, n.d.) And “to show that a close connection exists between (two or more things)” (Merriam-Webster, 2019) Also, “to show that two things are connected.” (Macmillan, n.d.) In statistics, we often […]

## Two-sample t-test for Correlation

## Zero Correlation?

I can see your confusion. To understand why I said that variables that have “zero correlation” might still be related, you need to remember that we were speaking of traditional correlation which is a linear relationship. We were discussing the Pearson moment correlation which we designate as “r.” An r of zero tells us that […]