Data Analysis and Statistics Vocabulary

A plot where each data value is split into a “leaf” (usually the last digit) and a “stem” (the other digits).

• class width

• histogram

• frequency polygon

• stem-and-leaf plot

A sample obtained in such a way that every element in the population has an equal chance of being selected for the sample.

• population

• sample

• random sample

• representative sample

A sample that represents characteristics typical of those possessed by the target population.

• population

• sample

• random sample

• representative sample

The numerical value of the data.

• data item

• data value

• frequency distribution

• frequency

The number of times each value occurs.

• data item

• data value

• frequency distribution

• frequency

The lowest range value of a class.

• classes

• grouped frequency distribution

• lower class limit

• upper class limit

The highest range value of a class.

• classes

• grouped frequency distribution

• lower class limit

• upper class limit

What is the interquartile range (IQR)?

• The sum of the first quartile and the third quartile.

• The data set divided into four equal parts.

• The difference between the first quartile and the third quartile.

• The median multiplied two.

What does the mean absolute deviation (MAD) measure in a data set?

• The average distance from the median.

• The average distance from the mean.

• The difference between the highest and lowest values.

• The sum of all data points divided by the number of points.

What is the median of a data set?

• The most frequently occurring value.

• The average of all data points.

• The middle number when the data is listed in order.

• The difference between the highest and lowest values.