Measures of Central Tendency and Variability Vocabulary

The middle of an ordered list of values. If the list has an odd number of values, it is the middle of the values of a list. If the list has an even number of values, it is the average of the two middle values.

Numerical values used to describe the overall clustering of data in a set, or the overall central value of a set of data.

The value found most often in a set of numbers.

The arithmetic average of a set of numbers. It is a measure of central tendency.

​ ​ ​ : the "average" value for the data.

​ : the value for which half the numbers are larger and half are smaller.

​ : To find, subtract the smallest value from the largest value in a set of data.

​ : The difference of the values of the first and third quartiles.

• Mean

• Median

• Range

• Interquartile Range

The ​ (a)   is the sum of all the numbers, divided by how many numbers were added together. The ​ (b)   is the middle number when the numbers are put in order. The ​ (c)   is the most common number. The ​ (d)   is the difference between the maximum and minimum values.

• mean

• median

• mode

• range

The ​ ​​ (a)   is found by adding all numbers in a set and dividing by how many numbers there are.

The ​ ​ (b)   is found by subtracting the highest and lowest.

The ​ (c)   is the number(s) that occurs the most often.

The ​ (d)   is the middle number.

• mean

• range

• mode

• median

• lower quartile

• upper quartile

The (a)   is the average of a data set.

The ​​ (b)   is the middle of a data set.

The​ ​ (c)   is the number that appears most often in a data set.

The​ ​ (d)   is the difference between the biggest and the smallest number in a data set.

The ​ (e)   is the difference between Q3 and Q1 in a data set.

• mean

• interquartile range (IQR)

• median

• mode

• range

​ When describing variability, Mean is best associated with​ (a)   and Median is best associated with ​ (b)  

• Standard Deviation

• Interquartile Range

• Range

• Mode

Match the following from the data set:

• 15

• Median

• 21

• Range

• 16

• Mode

• 20

• Mean