8.3 Measures of spread

If the mean is the same
but you can see that there are clear differences in the values in the list you can look at the deviation from the mean
and 
the mean deviation from the mean
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If the mean is the same
but you can see that there are clear differences in the values in the list you can look at the deviation from the mean
and 
the mean deviation from the mean

Slide 1 - Tekstslide

If the mean deviation from the mean is low 
then the numbers are all close to the mean

If the mean deviation from the mean id high 
then the numbers are more spread out from the mean

Slide 2 - Tekstslide

Slide 3 - Tekstslide

Slide 4 - Tekstslide

Slide 5 - Tekstslide

Range
In statistics, a small spread of data is when the data is close to the mean.

A measure of spread is the range.
The range is the difference between the highest and the lowest vale.

Range = Highest - Lowest

Slide 6 - Tekstslide

Lower quartile 
This is the median of the lowest (first)half of the data.
Q1

Slide 7 - Tekstslide

Upper quartile 
This is the median of the upper (second) half of the data.
Q3

Slide 8 - Tekstslide

Interquartile range
This is the difference between the lower and upper quartiles.
Interquartile range = 
This is also a measure of spread, just as the range is.
Q3Q1

Slide 9 - Tekstslide

Slide 10 - Tekstslide

Homework
Paragraph 8.3 pages 18 t/m 20
Exercises 17 t/m 20

Slide 11 - Tekstslide