1. Measures of Central Tendancy Press Ctrl-A ©2009 G Dear – Not to be sold/Free to use Stage 4 Years 7 & 8

2. Measures of Central Tendencies - Mean The Mean is a measure of central tendency Mean = Sum of the Scores Number of the Scores Example: 2, 3, 5, 4, 7, 6, 8. Mean = 2+3+5+4+7+6+8 7 35 7 = = 5

3. Measures of Central Tendencies - Median The Median is a measure of central tendency The Median is the middle score, Example: 2, 3, 4, 5, 7, 7, 8. Median = 5 When the scores are in order.

4. Measures of Central Tendencies - Median The Median is a measure of central tendency The Median is the middle score, Example: 2, 3, 4, 5, 7, 7, 8, 8. When the scores are in order. = 6 Median = 5+7 2

5. Measures of Central Tendencies - Mode The Mode is a measure of central tendency The Mode is the most common score, Example 1: 2, 3, 4, 5, 7, 7, 8. The score with the highest frequency. Mode = 7 Example 2: 2, 3, 4, 5, 7, 7, 8, 8. Mode = 7, 8 Polymodal

6. Example: 2, 3, 4, 5, 7, 7, 8, 8. Measures of Central Tendencies - Range The Range is a measure of spread Range = Highest Score - Lowest Score, Range = 8 - 2 = 6 Highest Score,Lowest Score,