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25 Cards in this Set
- Front
- Back
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quantitative
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data with mesurements in numbers
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qualitative
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data theat can be classified into different groups or categories
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categorical
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data that can be classified into different groups or categories
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univariate
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data with onely one measurement on each object
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bivariate
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data with two measurements on each object
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n
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number of observations in data set
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frequency
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number of times in a data set the observation occurs
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f
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frequency
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relative frequency
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ratio of frequency to the total number of observations
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rf
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relative frequency
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equation for relative frequency
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rf=f/n
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cumulative frequency
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number of observations less than or equal to a specified value
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cf
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cumulative frequency
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frequency distribution table
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table gving all possible values of data and their frequencies. RF, CF, midpoints of group, etc. may be added to frequency distribution tables if needed
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ungrouped frequency distribution table
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table where data points are reported as they occurred, giving a list of all values
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classes
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wehn categories for data points are grouped by some scheme into certain categories
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grouped frequency distribution table
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table where data points are grouped into classes
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class makrk
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halfway betwen upper limit and lower limit (midpoint for class)
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midpoint
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1/2 way between upper and lower limit
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true or false:
All RF from one distribution should add up to 1. |
True
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center distribution
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describes the point around which the data points are spread
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spread of distribution
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describes how data points are spread, using range of data values and vasteness or narrowness of spread
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symmetric distribution
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if 1/2 of distribution is approx. a mirror image of hte other, then the distribution is symmetric. Same # of obserivations on each side of midpoint
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left skewed disribution
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longer tail on left. lesser half of distribuiton extends further than the greater half.
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right skewed
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greater half of distribution extends fruther out than lesser half. longer tail on right.
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