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Finding Interquartile Range Introduction
1.
- Mr Kim
2.
Finding IQR for
even number of scores
3.
12 13 21
28 29 31 31 32 33 34 38 39
4.
12 13 21
28 29 31 31 32 33 34 38 39 Here are some random scores
5.
12 13 21
28 29 31 31 32 33 34 38 39 **Make sure the scores are in Ascending Order first!
6.
12 13 21
28 29 31 31 32 33 34 38 39 **Make sure the scores are in Ascending Order first!
7.
12 13 21
28 29 31 31 32 33 34 38 39 **Make sure the scores are in Ascending Order first! This means the scores are written from smallest to largest
8.
21 39 12
31 31 28 29 32 38 34 33 13 For example this is not in Ascending Order
9.
21 39 12
31 31 28 29 32 38 34 33 13 For example this is not in Ascending Order Because the scores are not written from smallest to largest
10.
12 13 21
28 29 31 31 32 33 34 38 39
11.
12 13 21
28 29 31 31 32 33 34 38 39 First, find the Median by crossing off the scores
12.
12 13 21
28 29 31 31 32 33 34 38 39 Start with the smallest score
13.
12 13 21
28 29 31 31 32 33 34 38 39
14.
12 13 21
28 29 31 31 32 33 34 38 39 Now cross off the largest score
15.
12 13 21
28 29 31 31 32 33 34 38 39
16.
12 13 21
28 29 31 31 32 33 34 38 39 Now cross off the next smallest score
17.
12 13 21
28 29 31 31 32 33 34 38 39
18.
12 13 21
28 29 31 31 32 33 34 38 39 Now cross off the next largest score
19.
12 13 21
28 29 31 31 32 33 34 38 39
20.
12 13 21
28 29 31 31 32 33 34 38 39 Next smallest score
21.
12 13 21
28 29 31 31 32 33 34 38 39
22.
12 13 21
28 29 31 31 32 33 34 38 39 Next largest score
23.
12 13 21
28 29 31 31 32 33 34 38 39
24.
12 13 21
28 29 31 31 32 33 34 38 39 Continue crossing off in that order
25.
12 13 21
28 29 31 31 32 33 34 38 39 “In”
26.
12 13 21
28 29 31 31 32 33 34 38 39 “Out”
27.
12 13 21
28 29 31 31 32 33 34 38 39 “In”
28.
12 13 21
28 29 31 31 32 33 34 38 39 “Out”
29.
12 13 21
28 29 31 31 32 33 34 38 39 Stop here
30.
12 13 21
28 29 31 31 32 33 34 38 39 Always stop at “Out”
31.
12 13 21
28 29 31 31 32 33 34 38 39 If you continue, you will cross off all the scores. You don’t want that!
32.
12 13 21
28 29 31 31 32 33 34 38 39
33.
12 13 21
28 29 31 31 32 33 34 38 39 The Median (Q2) is in between 31 and 31 which is…
34.
12 13 21
28 29 31 31 32 33 34 38 39 The Median (Q2) is in between 31 and 31 which is 31
35.
12 13 21
28 29 31 31 32 33 34 38 39 Now, put a line between those two scores
36.
12 13 21
28 29 31 31 32 33 34 38 39
37.
12 13 21
28 29 31 31 32 33 34 38 39 Now find the Median for both sides of the scores
38.
12 13 21
28 29 31 31 32 33 34 38 39 Start with this side
39.
12 13 21
28 29 31 31 32 33 34 38 39 Remember to cross off in the order: “In” “Out”
40.
12 13 21
28 29 31 31 32 33 34 38 39 “In”
41.
12 13 21
28 29 31 31 32 33 34 38 39 “Out”
42.
12 13 21
28 29 31 31 32 33 34 38 39 “In”
43.
12 13 21
28 29 31 31 32 33 34 38 39 “Out”
44.
12 13 21
28 29 31 31 32 33 34 38 39 Stop here
45.
12 13 21
28 29 31 31 32 33 34 38 39
46.
12 13 21
28 29 31 31 32 33 34 38 39 The Lower Quartile (Q1) is in between 21 and 28 which is…
47.
12 13 21
28 29 31 31 32 33 34 38 39 The Lower Quartile (Q1) is in between 21 and 28 which is… 21
48.
The Lower Quartile
(Q1) is in between 21 and 28 which is… 12 13 21 28 29 31 31 32 33 34 38 39 2821
49.
The Lower Quartile
(Q1) is in between 21 and 28 which is… 12 13 21 28 29 31 31 32 33 34 38 39 2 2821
50.
The Lower Quartile
(Q1) is in between 21 and 28 which is… 12 13 21 28 29 31 31 32 33 34 38 39 5.24 2 2821
51.
12 13 21
28 29 31 31 32 33 34 38 39 The Lower Quartile (Q1) is in between 21 and 28 which is 24.5
52.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5
53.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5
54.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 Now cross off this side of the scores
55.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 “In”
56.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 “Out”
57.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 “In”
58.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 “Out”
59.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 Stop here
60.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5
61.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 The Upper Quartile (Q3) is in between 33 and 34 which is …
62.
The Upper Quartile
(Q3) is in between 33 and 34 which is … 12 13 21 28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 33
63.
The Upper Quartile
(Q3) is in between 33 and 34 which is … 12 13 21 28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 3433
64.
The Upper Quartile
(Q3) is in between 33 and 34 which is … 12 13 21 28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 2 3433
65.
The Upper Quartile
(Q3) is in between 33 and 34 which is … 12 13 21 28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 5.33 2 3433
66.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 The Upper Quartile (Q3) is in between 33 and 34 which is 33.5
67.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 Upper Quartile: 33.5
68.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 Upper Quartile: 33.5 Interquartile Range= Upper Quartile – Lower Quartile
69.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 Upper Quartile: 33.5 Interquartile Range= Upper Quartile – Lower Quartile
70.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 Upper Quartile: 33.5 Interquartile Range= Upper Quartile – Lower Quartile 33.5 -
71.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 Upper Quartile: 33.5 Interquartile Range= Upper Quartile – Lower Quartile 33.5 -
72.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 Upper Quartile: 33.5 Interquartile Range= Upper Quartile – Lower Quartile 33.5 – 24.5
73.
12 13 21
28 29 31 31 32 33 34 38 39 Lower Quartile: 24.5 Upper Quartile: 33.5 Interquartile Range= Upper Quartile – Lower Quartile 33.5 – 24.5 = 9 Our Final Answer!
74.
Finding IQR for
odd number of scores
75.
16 31 37
39 42 44 56 58 60 63 71 Here are some random scores
76.
16 31 37
39 42 44 56 58 60 63 71 Same steps as before. Find the Median by crossing off the scores
77.
16 31 37
39 42 44 56 58 60 63 71 **Make sure the scores are in Ascending Order first!
78.
16 31 37
39 42 44 56 58 60 63 71 “In”
79.
16 31 37
39 42 44 56 58 60 63 71 “Out”
80.
16 31 37
39 42 44 56 58 60 63 71 “In”
81.
16 31 37
39 42 44 56 58 60 63 71 “Out”
82.
16 31 37
39 42 44 56 58 60 63 71 “In”
83.
16 31 37
39 42 44 56 58 60 63 71 “Out”
84.
16 31 37
39 42 44 56 58 60 63 71 “In”
85.
16 31 37
39 42 44 56 58 60 63 71 “Out”
86.
16 31 37
39 42 44 56 58 60 63 71 “In”
87.
16 31 37
39 42 44 56 58 60 63 71 “Out”
88.
16 31 37
39 42 44 56 58 60 63 71 Stop here
89.
16 31 37
39 42 44 56 58 60 63 71 So the Median (Q2) is 44
90.
16 31 37
39 42 44 56 58 60 63 71 Put 2 lines around the Median
91.
16 31 37
39 42 44 56 58 60 63 71
92.
16 31 37
39 42 44 56 58 60 63 71 Now find the Median for both sides of the scores
93.
16 31 37
39 42 44 56 58 60 63 71 Start with this side
94.
16 31 37
39 42 44 56 58 60 63 71 “In”
95.
16 31 37
39 42 44 56 58 60 63 71 “Out”
96.
16 31 37
39 42 44 56 58 60 63 71 “In”
97.
16 31 37
39 42 44 56 58 60 63 71 “Out”
98.
16 31 37
39 42 44 56 58 60 63 71 Stop here
99.
16 31 37
39 42 44 56 58 60 63 71 The Lower Quartile (Q1) is 37
100.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37
101.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37
102.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 Now cross off this side of the scores
103.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 “In”
104.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 “Out”
105.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 “In”
106.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 “Out”
107.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 Stop here
108.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 The Upper Quartile (Q3) is 60
109.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 Upper Quartile: 60
110.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 Upper Quartile: 60 Interquartile Range= Upper Quartile – Lower Quartile
111.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 Upper Quartile: 60 Interquartile Range= Upper Quartile – Lower Quartile 60 -
112.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 Upper Quartile: 60 Interquartile Range= Upper Quartile – Lower Quartile 60 - 37
113.
16 31 37
39 42 44 56 58 60 63 71 Lower Quartile: 37 Upper Quartile: 60 Interquartile Range= Upper Quartile – Lower Quartile 60 – 37 = 23 Our Final Answer!
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