Formulas for r in the textbook use the standard deviation, $\hat { S }$ .

Name: Formulas for r in the textbook use the standard deviation, $\hat { S }$ .
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Formulas for r, which typically refers to the correlation coefficient, use the standard deviation denoted as $S$ (without the hat). The hat notation ($\hat { S }$) is not standard for representing standard deviation; it is more commonly used to denote an estimator or a predicted value in statistical contexts.

Formulas for R in the Textbook Use the Standard Deviation S^\hat { S }S^

Formulas for R in the Textbook Use the Standard Deviation $\hat { S }$