Descriptive Statistics Vocab

The median of the lower half of a set of data.

• interquartile range

• frequency

• lower quartile

• upper quartile

an observation that does not fit the rest of the data

• outlier

• quartiles

• median

• frequency

the middle score in a distribution; half the scores are above it and half are below it

• variance

• median

• mode

• mean

the arithmetic average of a distribution, obtained by adding the scores and then dividing by the number of scores.

• variance

• mean

• median

• mode

two data sets that have a one-to-one relationship so that

- both data sets are the same size, and

- each data point in one data set is matched with exactly one point from the other set

• percentile

• paired data set

• upper quartile

• twin data set

A graph that displays the highest and lowest quarters of data as whiskers, the middle two quarters of the data as a box, and the median

• histogram

• box plot

• quartiles

• bar graph

The median of the upper half of a set of data

• frequency

• interquartile range

• lower quartile

• upper quartile

a computer measure of how much scores vary around the mean score

• standard deviation

• upper quartile

• histogram

• interquartile range

the most frequently occurring score(s) in a distribution

• outlier

• median

• mode

• mean

A point on a ranking scale of 0 to 100. The 50th percentile is the midpoint; half the people in the population being studied rank higher and half rank lower.

• histogram

• box plot

• paired data set

• percentile