Flashcards
Statistics
Flashcards do conjunto (10)
- 1whats a summary table?a table that indicate the frequency,amount or percentage of items in a set of categories so that you can see differences between categories.
- 2whats frequency distribution?is a summary table in which the data are arranged into numerically ordered classes.
- 3whats class groupings?Is the determination of a suitable width of a class grouping, and establishing the boundaries of each class grouping to avoid overlapping.
- 4Steps for computing standard deviation1.compute the difference value and mean
2. square each difference.
3.add the square differences
4.divide this total by n-1 to get the sample variace
5.take the square root of the sample variace to get the sample standard deviation. - 5whats coefficient of Variation?shows variation relative to mean
CV = ( starndard deviation / Mean) * 100 % - 6whats the z score?is the number of standard deviations a data value is from the mean.
- 7how do you compute the z score?data value - mean all devided by the standar deviation.
- 8whats considered an outlier?a value is considered an outlier if its z score is less than -3.0 or greater than +3.0
- 9skewness?Measures the amount of asymmetry in a distribution.
- 10Kurtosis?Measures the relative concentration of values in the center of a distribution as compared with the tails.
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- FlashCards sobre Statistics, criado por wilsonvivas32 em 23-03-2015.
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- wilsonvivas32
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