Confidence intervals
Having established that there certainly is a correlation in the wider population, we might want to quantify the range of values we expect 
to lie within by calculating a confidence interval. As in the previous chapter with the mean, the confidence interval of r expresses the probability (expressed as a percentage) that the population parameter lies between two specific values.
However, a complication arises when trying to calculate the standard error of the correlation coefficient that didn't exist for the mean. Because the absolute ...
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