Statistics: Percentiles, Z-scores, and Normal Distributions
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7 Terms
Percentile
the value with p% of observations less than or equal to it
Standardized Score (z-score)
tells us how many standard deviations from the mean the value falls and in what direction
Cumulative Relative Frequency Graph
plots a point corresponding to the percentile of a given value in a distribution of quantitative data. Consecutive points are then connected with a line segment to form the graph
Normal Curve
a symmetric, single-peaked, mound-shaped curve
Normal Distribution
distribution described by a normal curve and completely specified by the mean and standard deviation
The Empirical Rule
About 68% of the values fall within one standard deviation of the mean
About 95% of the values fall within two standard deviations of the mean
About 99.7% of the values fall within three standard deviations of the mean
Standard Normal Distribution
the normal distribution with mean 0 and standard deviation 1
Note 
Flashcards (35)