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Is it really normal? QQ-plots and normality tests (Shapiro–Wilk, Anderson–Darling)
A histogram looks roughly bell-shaped. The sample mean and median are close. The skewness is small. Your statistical software reports a p-value of 0.0001.
A histogram looks roughly bell-shaped. The sample mean and median are close. The skewness is small. Your statistical software reports a p-value of 0.0001.