Correlation – Part 2

We know from the previous post that correlation gives us a number that tells us about the relationship between two variables (usually named X and Y). There are several types of correlation, but the most common one you’re likely to see discussed in research articles is Pearson’s r. The correlation coefficient that Pearson’s r produces is a ratio of how the variables vary together (their covariability) and how they vary…

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Measures of Central Tendency – The Median

Out of the three measures of central tendency, the mean is the most common but it isn’t appropriate unless our data is normally distributed and continuous. What if we have continuous data, but it is skewed instead of normal? First, what is skewed data? When we think of normally distributed data, we might imagine the normal curve where most of the values are in the middle of the distribution with…

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