Fundamental Statistics in Psychology and Education

01 level ability Appendix apply arithmetic mean average beta binomial biserial cent centile Chap chi square class interval coefficient of correlation column combined common factors composite computed contingency table correction corresponding criterion cumulative degrees of freedom derived determine diagram difference equal error variance examinees example experimental formula frequencies given gives illustration indicate individuals intercorrelations kind limits M₁ mathematical median method midpoint multiple normal curve normal distribution null hypothesis obtained one-tail test pairs Pearson percentage phi coefficient point-biserial population mean prediction probability problem procedure proportions psychological range ratio raw scores raw-score regression equation reliability sample mean sampling distribution sampling statistics scale significant skewed standard deviation standard error standard scores statistical Step sum of squares tetrachoric tion two-tail test units validity coefficient values variables weight X₁ zero σ² ΣΧ