How to do a Pearson Correlation by Hand (13-7)
Research By Design
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How to do a Pearson Correlation by Hand teaches you how to manually calculate and interpret Pearson’s r, test its significance with a t-test, and understand when to use alternatives like Spearman’s or Kendall’s for non-normal data.
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A Pearson product-moment correlation test revealed that the number of apples consumed per day and annual doctor visits were strongly inversely related, r(8) = -.95, p < .05. Increases in apple consumption were accompanied by decreases in physician visits; therefore, 90% of the variance in obtained medical services was explained by apple consumption.
—Research By Design
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