Z-scores X (test scores) = 3, 5, 8, 8, 9, 4, 7, 8, 6, 7, 10 %3D •Calculate the mean of x •Calculate the variance of x •Calculate the standard deviation of x •Calculate the z-score for the first and last person •Are they statistically significantly different from the mean? Σ 1-1 X%3D E(x-x)² X; X- S = = Z n-1

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