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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.
Q
1
Slide 7 - Tekstslide
Upper quartile
This is the median of the upper (second) half of the data.
Q
3
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.
Q
3
−
Q
1
Slide 9 - Tekstslide
Slide 10 - Tekstslide
Homework
Paragraph 8.3 pages 18 t/m 20
Exercises 17 t/m 20
Slide 11 - Tekstslide
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