AP Stat Vocabulary Unit 2

tells us how many standard deviations from the mean an observations falls, and in what direction (value - mean / SD)

the value with p% of observations LESS THAN OR EQUAL to it

plots a point corresponding to the percentile of a given value in a distribution of quantitative data

converts the original observations from the original units of measurements to another scale

the area under this curve and above any interval of values on the horizontal axis estimates the proportion of all observations that fall in that interval

the point at which the curve would balance if made of solid material

the equal-areas point, the point that divides the area under the curve in half

described by a symmetric, single-peaked, bell-shaped density curve called a NORMAL CURVE

in a normal distribution, ~68% of observations fall within 1 SD of the mean, ~95% of observations fall within 2 SD of the mean, and ~99.7% of observations fall within 3 SD of the mean

the normal distribution with mean 0 and SD 1 —- use when referring to z-scores

the normal distribution with mean 0 and SD 1 (use when referring to z-scores)