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Correlation

Question

Wired Faculty App

Calculate height and weight of the students of a class.

Height (in inches)

57

59

62

63

64

65

55

58

57

Weight in (Pounds)

113

117

126

126

130

129

111

116

112

Solution

X	dx (x-60)	d²x	y	dy(y–120)	d²y	dxdy
37	–3	9	113	–7	49	21
59	–1	1	117	–3	9	3
62	+ 2	4	126	+ 6	36	12
63	+ 3	9	126	+ 6	36	18
64	+ 4	16	130	+ 10	100	40
65	+ 5	25	129	+ 9	81	45
55	–5	25	111	–9	16	6
58	–2	4	116	–4	16	8
57	–3	9	112	–8	64	24
	ΣdX = 0	Σd²X = 100	dy = 0	d²y = 472	ΣdXd = 216

Some More Questions From Correlation Chapter

The unit of correlation coefficient between height in feet and weight in kgs is:

The range of simple correlation coefficient is:

If r_xy is positive the relation between X an Y is of the type:

If r_xy = 0 the variable X and Y are:

Of the following three measures which can measure any type of relationship:

If precisely measured data are available the simple correlation coefficient is:

Why is r preferrred to co-variance as a measure of association?

Can r lie outside -1 and 1 range depending on the type of data?

Does correlation imply causation?

When is rank correlation more precise than simple correlation coefficient?

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