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arithmetic mean arrange the scores average calculated called central tendency characteristics class interval computed standard scores Computing Percentile Ranks correlation coefficient desirable interval different tests divide easy Educational Psychology ELEMENTARY STATISTICAL METHODS evaluation examinations example formula give given by different Given Score Grouped Frequency Distribution important individual interpretation Khartoum knowledge large number lowest score mean deviation measure of central measure of variability measuring instrument median middle 50 midscore norm normal distribution number of categories number of pupils number of scores obtain parameter phi coefficient population possible procedure Product-Moment quartile random range Rank Correlation reliability Salma's score sampling distribution sampling statistics scatter diagram secondary school teachers set of scores situation skewed stanine step Sudan Sudanese supply-type tests Table Five Table Nine Computation Table Seven Table Three test scores thing tion total number UNIVERSITY OF WISCONSIN usually Validity Coefficients values z scores zero