# Unit 5: Radical Expressions and Data Analysis

Box-and-Whisker Plot

A graph that displays data along a number line and indicates the minimum and maximum data values as well as the first quartile, the median, and the third quartile of the data set.

Conjugates

The sum and the difference of the same two terms.

Cumulative Frequency Table

A table that shows the number of data values in or below a given interval.

Frequency

The number of data items in an interval.

Frequency Table

A table that shows data values grouped into intervals and the frequency for each interval.

Histogram

A type of bar graph that displays data from a frequency table where the height of the bar shows the frequency of the interval it represents.

Interquartile Range

The difference between the third quartile and the first quartile of a data set.

Mean

The sum of the data values in a set divided by the number of data values in a set.

Measure of Central Tendency

A value used to describe or summarize a set of data; may be the mean, the median, or the mode of a data set.

Measure of Dispersion

The range, percentiles, and the standard deviation.

Median

The middle value in an ordered set of data.

Mode

The most frequently occurring value (or values) in a data set.

Outlier

A data value that is much higher or lower than the other data values in a set.

Percentile

A value that separates a data set into 100 parts.

Percentile Rank

The percentage of data values less than or equal to a given value.

Quartile

The values that divide a set of data into four equal parts, where the 2nd quartile value is the median of the set, the 1st quartile value is the median of the lower half of the set, and the 3rd quartile value is the median of the upper half of the set.

An expression that contains a radical.

Range of a Set of Data

The difference between the maximum and the minimum values of a data set.

Rationalize The Denominator

To rewrite an expression so there are no radicals in any denominator.

Square Root Function

A function that contains the independent variable in the radicand of a square root.