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01 level ability achievement approximately arithmetic mean Army Alpha scores boys calculated central tendency chance class-interval coefficient of correlation column computed correction correlation coefficient correlation table criterion cumulative frequency degrees of freedom determined diagram difference entry equal error of estimate example F-unit factors fall five formula frequency distribution frequency polygon girls given gives grades height and weight hence honor points illustrate inches interval kurtosis lower limit measures median method midpoint multiple correlation normal curve normal distribution normal probability curve null hypothesis number of scores ogive order of merit percent percentage percentile rank plotted population predicted problem range ratio regression equation regression lines relationship reliability coefficient represent result sample scale shown significant figures skewness standard deviation standard error Statistical Step sum of squares T-scores Table 17 Table 29 test items test scores tion ungrouped units variables variance X-axis zero