Taammi P.

Frequency Table

A table used to organize data according to how many times a data value occurs.

Lower class limit

Smallest data value that can be included in the class.

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Upper class limit

The highest data value that can fit in a class.

Class width

The difference between the lower class limit of one class and the lower class limit of the next class.

Class frequency

The number of tally marks corresponding

to that class.

to that class.

Class midpoint or class mark

- The center of each class is called the midpoint (or class mark).
- The midpoint is often used as a representative value of the entire class.
- The midpoint is found by adding the lower and upper class limits of one class and dividing by 2.

Class boundaries

- A bar graph in which the bar height represents frequency of an event.
- In addition, the bars are arranged from left to right according to decreasing height.

Relative-frequency table

- First make a frequency table.
- Then, for each class, compute the relative frequency, f/n,
- Where f is the class frequency and n is the total sample size.

Cumulative frequency

The sum of the frequencies for that

class and all previous classes.

class and all previous classes.

Ogive

An ogive (pronounced “oh-ji-ve”) is a graph that displays cumulative frequencies.

time series data

Data that are produced and measured over time.

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Stem-and-leaf display

A method of exploratory data analysis that is used to rank-order and arrange data into groups.

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