percentile rank- indicates the persentage of scores less than or equal to a particular score, is the proportion of scores in a distribution that a specific score is greater than or equal to.
normal curve- a graph resembling a bell-shaped curve
correlation coefficient- the relationship between two set of data
negative correlation- as one variable increases the other decreases or as one variable decreases so does the other
positive correlation- as one variable increases so does the other or as one variable decreases so does the other
r-value- correlation coefficiant
zero correlation- the variables have nothing to do with each other, so there is no relation between the two sets of data
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