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14 Cards in this Set
- Front
- Back
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Variable
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a characteristic that varies from one thing to another
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Catergorical Variable
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non numeric variables
example: eye color, gender, blood type |
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Quantitative Variable
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numeric valued variable
example: weight, height, time, # of people in line |
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Raw data
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listed in the order it was collected.
hard to spot meaningful data patterns in raw data |
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Lower Cutpoint
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left hand boundary of the class description
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Upper Cutpoint
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right hand boundary of the class description
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Frequency
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the number of items in a class
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Relative Frequency
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the ratio (as a decimal) of the number of items in each class to the total number of items
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Midpoint
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the average of the lower and upper cutpoints.
representative value for the items in the class |
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Width/Increment
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the difference between consecutive lower cutpoints
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Rounding Note
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if you round a relative frequency, always use at least 4 decimal places
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Grouped Data Table
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a table with classes, frequencies, relative frequencies, and midpoints (if appropriate)
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Grouping continuous Data
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when grouping continuous data, it is common to use the symbol, -<, We read -<as>.
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Single Value Grouping
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each class consists of a single value
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