# 8-2 Measures of Central Tendency and Range - PowerPoint PPT Presentation

1 / 8

8-2 Measures of Central Tendency and Range. Measure of Central Tendency. A number used to describe the center of a set of data. Mean, Median, Mode. Mean. The sum of the data divided by the number of items in the set “average” The average teacher is Mean

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

8-2 Measures of Central Tendency and Range

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

## 8-2 Measures of Central Tendency and Range

### Measure of Central Tendency

• A number used to describe the center of a set of data

• Mean, Median, Mode

### Mean

• The sum of the data divided by the number of items in the set

• “average” The average teacher is Mean

• Ex: 1 cm, 1 cm, 5 cm, 2 cm, 2 cm, 4 cm, 2 cm, 5 cm

### Mode

• The number that occurs most often.

• Mode = most often

• No mode

• One mode

• Two modes

### MedianHighway medians are in the middle.

• After the data set has been ordered least to greatest, it is the middle number or the mean(average) of the two middle numbers

• Ex: 15 yd, 7 yd, 20 yd, 17 yd, 11 yd, 20 yd

### Range

• Is a “measure of variation”

• Difference between the least and greatest values

### When to use what???

• Mean- when data has no outliers

• Median- when data has outliers and there are no big gaps in the middle of the data

• Mode- data has many identical numbers

• Range- to describe the spread of data