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Calculate Cumulative Frequency Curves, Quartiles and IQR
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Calculate Cumulative Frequency Curves, Quartiles and IQR
1.
Cumulative Frequency Curves
2.
3.
Cumulative Frequency
4.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3
5.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3 Cumulative Frequency
6.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3 Cumulative Frequency 7
7.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3 Cumulative Frequency 7 19
8.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3 Cumulative Frequency 7 19 34
9.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3 Cumulative Frequency 7 19 34 37
10.
Upper Class Boundary
11.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3 Cumulative Frequency 7 19 34 37 Upper class boundary
12.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3 Cumulative Frequency 7 19 34 37 Upper class boundary 45
13.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3 Cumulative Frequency 7 19 34 37 Upper class boundary 45 50
14.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3 Cumulative Frequency 7 19 34 37 Upper class boundary 45 50 55
15.
Height (mm)
Frequency F 40 X 45 45 X 50 7 12 50 X 55 15 55 X 60 3 Cumulative Frequency 7 19 34 37 Upper class boundary 45 50 55 60
16.
Plot the curve
17.
Cumulative Frequency 7
19 34 37 Upper class boundary 45 50 55 60
18.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
19.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
20.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
21.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
22.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
23.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
24.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
25.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
26.
Median
27.
Cumulative Frequency 7
19 34 37 Upper class boundary 45 50 55 60
28.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
29.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
30.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
31.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency Median ≈ 49mm
32.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency Median ≈ 49mm
33.
Quartiles
34.
The lower
quartile tells us what value 25% of the sample are less than
35.
The upper
quartile tells us what value 75% of the sample are less than
36.
37 cress seeds
in total
37.
A quarter of
37 is 9.25 Three quarters is 27.75
38.
We use the
graph to find what lengths correspond to cumulative frequencies of 9.25 and 27.75
39.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
40.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
41.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
42.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency LQ ≈ 45mm
43.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
44.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
45.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency
46.
Cress seedling height
0 10 20 30 40 35 40 45 50 55 60 Height (mm) Cumulative frequency UQ ≈ 52mm
47.
Inter-quartile range
48.
The difference between
the upper and lower quartile
49.
Median ≈ 49mm
LQ ≈ 45mm UQ ≈ 52mm IQR ≈ UQ – LQ ≈ 7mm
50.
Tells you the
range of values occupied by the middle 50% of your sample
51.
Summary
52.
53.
Your turn