Statistics Vocab
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Variance | average of the squared differences of all the values from the mean. standard deviation squared.
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| Standard deviation | square root of the average of the squared differences of all the values from the mean. square root of variance
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| Skewed to the right | has a long tail on the right side or the positive side.
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| Skewed to the left | has a long tail on the left side or the negative side
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| Empirical rule | 34-13.5-2.35
68% of the values lie within one standard deviation
95% of the values lie within two standard deviations
99% of values lie within three standard deviations
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| Range | Difference between the largest and the smallest number
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| Interquartile range (IQR) | Difference between the third and first quartile
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| Simple ranking | I am top 25 out of 583 students. I am the seventh best detergent out on the market.
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| Percentile ranking | convert simple rank to a percentage
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| z-score | how many standard deviations something is from the mean
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| correlational coefficient | quantitative value of the strenght of a linear relationship. -1<r<1
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| strongly positively associated (scatter plot) | slope is positive and all values are close to the line of best fit
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| negatively associated (scatter plot) | slope is negative
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| residual plots | plot of the difference between the actual value and the line of best fit. sum of the residuals equals zero
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| outliers | values that fall away from the overall pattern. a point is an outlier if its residual is an outlier in a set of residuals
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| influential scores | scores whose removal would sharply change the regression line. typically found on the ends of the line.
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Created by:
KevinFan
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