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MEASURES OF CENTRAL TENDENCY: mean - average score, median - middle score...half scores below median, half scores above median...best to use, mode - most frequently occurring score or scores, The average score is 84., The most common score is 78., There are 13 scores above and below 81., RANGE: difference between largest and smallest value in data set, Scores varied anywhere from 64 to 98., STANDARD DEVIATION: measures how spread out data is from the mean and helps us see what is considered normal or abnormal, SD = 2.5, , STATISTICAL SIGNIFICANCE: results are most likely NOT due to chance, The researchers are confident their test results are valid., p-value, p < .05, CORRELATION COEFFICIENT: a numerical value (between -1 to +1) that shows the strength and direction of relationship between 2 variables, r = .9, r = -1, , effect size, PERCENTILE RANK: a number between 1 and 99… percentage of scores that are less than a given score, Nancy scored a 1280 on the SATS putting here in the 83rd percentile., SKEWNESS: a few extremely high or low scores that make the average score misleading, Three students scored very poorly on the exam, significantly lowering the class average on the test., ,

AAQ: Statistics Practice

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