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Psy 103 quantitative methods in psychology study sheet 2 formulas sample mean x x n ss x sums of squares 2 ( x ) s (x x ) n s2 population variance 2 n 1 x 2 ( x ) n 1 ztest formula (x ) 2 z s s 2 2 n or n z 2 2 sample standard deviation zscore...
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