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10 Cards in this Set
- Front
- Back
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frequency distribution
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a table that displays the frequency of various outcomes in a sample. Each entry int he table contains the frquency or count of the occurences of values within a partiouclar group or interval, and thus this table sumamrizes the distribution of values in the sample.
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percentage distribution
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a display of data that specifies the percentage of observations that exist for each data point or grouping of data points. This is a good way of expressing the relative frequency of survey responses and other data
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percentile
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each of the 100 groups nto which a populartion can be divided according to the distribution og values of a particular variable-- each of the 99 intermediate values of a random variable that devide the frequency distribution into 100 groups
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quartile
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a type of quanile. Q1: middle number between the min and the median / Q2: the median / Q3: the middle value between the median and the max
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interquartile range
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the IQR is a measure of variability, based on dividng a data set into quartiles--> equal parts (Q1-Q3)
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outlier
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a sata point that stands out from the rest--either much smaller or much bigger thna the nearest data point
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mode
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the value that occurs most frequently in a set of data
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median
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a measure of cnetral tendency-- the middle value (or avreage of two middle values if data set is even numbered)
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mean (formula and verbal description)
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the sum of values in a sample divided by the number of values; the average
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five number summary
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The min, Q1, median, Q3, and max--> boxplot is a visual display of this
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