# Selecting Statistics

### Statistical Test

Skewness

### Statistical Measure

*(none)*

### Notes

To test departures from normality: for N greater than 150, refer the critical ratio of the skewness measure to a table of the unit normal curve; for N between 25 and 150, refer the skewness measure to a table for testing skewness. This is a biased estimator.
Skewness: McNemar, Q. Psychological Statistics. Fourth edition. New York: Wiley 1969. p. 25

Critical ratio of skewness: Snedecor, G. W., and Cochran, W. G. Statistical Methods. Sixth edition. Ames, lowa: The lowa State University Press, 1967. p. 86

Table for testing skewness: Snedecor, G. W., and Cochran, W. G. Statistical Methods. Sixth edition. Ames, lowa: The lowa State University Press, 1967. p. 552

#### SPSS: CONDESCRIPTIVE, FREQUENCIES

SAS: UNIVARIATE, MEANS