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### 6 Cards in this Set

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 What are the two most common ways of showing distribution of scores? Histogram; frequency polygon What are the measures of central tendancy? Center or middle distribution of scores, (mean, median, and mode) When is the median the best measures of central tendancy? In a skewed distribution What are two measures of score variability? Range and standard deviation How is standard deviation calculated? 1. Compute diff. between each score and mean 2. Square those differences 3. Calculate mean of the squares of the differences 4. Take the square root of this mean Why do you have to square the differences? If add up diff. of scores and divide by number of scores, get zero