STANDARD DEVIATION, A MEASURE OF HOW SPREAD-OUT NUMBERS ARE.​, Range, The distance in numerical value from the highest to the lowest value collected.​ subtracting the lowest value from the highest value. , Rank–order distribution​, Placing your data into an ordered list from the lowest to the highest in a single column, ensuring you include all the scores.​, Relationship, A Tests that measure whether two or more variables are related​., Dependent variable , a variable (often denoted by y) whose value depends on that of another. Also called response variable., Independent variable, A variable that is manipulated , Average, The mean of data. Calculated by adding up the total of the data and dividing it by the number of data points., Causation, a direct relationship between two variables., Correlation coefficient, An r value used to measure the strength of a relationship , Median, The middle point of data, Mode, Mode refers to the value in a database that repeats the most number of times. .

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