COM 200 Review_Sheet-1

COM 200 Review_Sheet-1 - Review Sheet Mean: average = Sum/n...

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Review Sheet Mean : average = Sum/n median :middle of series mode : most common Outliers : far removed from the rest of the data Variability: Minimum: smallest number maximum : largest number range: distance between minimum and maximum interquartile range: differences between the upper and lower quartiles Quartiles are the medians of the two halves of the list lower quartile: one quarter from the bottom upper quartile: one quarter from the top How to read stem and leaf plots: How to read histogram s: display the shape of date distributions 1. Divide dataset into intervals, or bins, or equal width 2. Count # of cases per bin 3. Bar height = # of cases within that bin Shapes: can be derived from a certain kind of picture of the data bell : symmetric and shaped like a bell symmetric : one that you can split in half evenly skewed: Negative (left) skew: tail goes down toward negative numbers Positive (right) skew: tail goes toward positive numbers Standard deviation : a measure of the spread of a distribution of numbers. It is the average distance from the mean Calculate the mean find deviations from the mean for each value(value-mean)
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Square these deviations
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COM 200 Review_Sheet-1 - Review Sheet Mean: average = Sum/n...

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