Describing Data Measures of Central Tendency

[Pages:35]Basic Statistics

Describing Data ? Measures of Central Tendency

Describing Data Learning Intentions

Today we will understand:

Measures of Central Tendency * Mean * Median * Mode

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Describing Data

Two descriptions of data: Measures of Central Tendency Measures of Dispersion

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Measures of Central Tendency Mean Median Mode

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Mean

Arithmetic average

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Mean

Calculate the mean height of JCU students

= (175 + 163 + 155 + 149 + 180 + 165) 6

= 987 6

Height (cm) 175 163 155 149 180 165

= 164.5 cm

You try......

1)

Weight (g)

2)

23

50

16

44

36

29

47

52

35

42

41

28

26

24

38

Time (s) 90 63 87 56 71 38 42 52 86 79 67 83 69 82 64

3)

Length (m)

5.3

2.8

3.6

3.9

2.7

4.8

4.2

6.2

5.9

5.1

4.6

5.3

6.9

Answers

1)

= (23 + 50 + 16 + 44 + 36 + 29 + 47 + 52 + 35 + 42 + 41 + 28 + 26 + 24 + 38)

15 = 531 = 34.5 g

2)

= (90 + 63 + 87 + 56 + 71 + 38 + 42 + 52 + 86 + 79 + 67 + 83 + 69 + 82 + 64)

15 = 1029 = 68.6 s

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