## AP Stat 2.1 Vocab.

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MelissaPuntkattalee  on August 24, 2010

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# AP Stat 2.1 Vocab.

 Density Curveis always on or above the horizontal axis AND has an area of exactly 1 underneath it (idealized)
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#### Definitions

Density Curve is always on or above the horizontal axis AND has an area of exactly 1 underneath it (idealized)
Median of a density curve the equal-areas point, the point with half the area under the curve to its left and the other half of the area to its right
Mean of a density curve the point at which the curve would balance if made of solid material
simulation imitate the appearance or character of
Frequency Histogram a histogram that plots the number of times each outcome occurs
Normal Curve these curves are symmetric, single-peaked, and bell-shaped
Normal distributions describe a normal curve using mean and its standard deviation
Inflection point the point at which the shape of the curvature changes (from falling steeply to not as steeply); this point is located at a distance σ (standard deviation) on either side of the mean μ
68-95-99.7 Rule In the normal distribution with mean μ and standard deviation σ: 1) 68% of the observations fall within σ of the mean μ. 2)95% of the observations fall within 2σ of μ. 3) 99.7% of the observations fall within 3σ of μ
percentile the percent of the distribution that is at or to the left of the observation

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