Lesson - Measures of central tendency

Learning Intention: describe common measures of central tendency

Diagnostic:

Explanation:

Mode

• The mode in a set of data is the data value that appears the most often.

•  the only average that can be used for categorical or non-numerical data. (e.g. Method of transportation)

Mean

• most commonly used average.

Median

• is the middle value of a set of numbers arranged in order.

• To find the median of an even numbered data set, add the two middle numbers and divide by 2.

Range

• The range of a set of data is a measure of how the data is spread across the distribution.

Each type of average has its purpose and sometimes one is preferable to an other.

• Mode: eliminates extreme values, only to use for categorical data

• Median: not affected by extreme values

• Mean: takes into account all values in data set

Example:

Tasks:

Diagnostic answers: