statistics 2300 Chapter 3.4-.5

Measures that determine the position of a single value in relation to other values in a data set. Quartiles, percentiles, and percentile rank are examples of measures of position.

measure the distance of a score from the mean in units of standard deviation

if the data value is larger than the mean it is a _____ z-score

if the data value is smaller than the mean it is a _____ z-score

breaks observation into 100 parts

z score formula

68%

95%

99.7%

Values that divide a data set into four equal parts

25th percentile

the median of the entire data set

the median of the upper half of the data set

Q3-Q1, the middle 50% of the data, resistant

lower fence

upper fence

are better measures of center and spread for skewed distributions.

are better measures of center and spread for relatively symmetric distributions.

minimum, Q1, median, Q3, maximum

A graph of the five-number summary., number line, box from lower quartile Q1 to upper quartile Q3, line at median, line to smallest and largest (not outliers)

Lines from the min to Q1 and from Q3 to the max

are marked w asterisk