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Marks in 70
Test I
Marks in 65
Test II 68 67 55 60 60 75 63 60 72 65 80 60 68 58 75 62 60 70 216 51. Calculate spearman’ s Rank correlation coefficient for the
following table of marks of students in two subjects.
First
80 64 54 49 48 35 32 29 20 18 15 10
subject
Second 36 38 39 41 27 43 45 52 51 42 40 52
subject
IV. Suggested Activities
Select any ten students from your class and find their heights
and weights. Find the correlation between their heights and
weights
Answers:
I.
1. (a).
2. (d)
6. (c)
7. (a)
II.
11. Units
14. Pearson
17. Qualitative
III.
30. r = 0.9574
33. n = 10
36. r =  0.96
39. r = +0.64
42. r = +0.746
45. r = +0.0945
48. r =  0.905
51. r = 0.685 3. (b)
8. (b) 4.(b) 5. (a)
9. (c) 10. (b) 12. Scatter diagram
15. Positive perfect
18. No correlation 13. Multiple
16. Symmetric 31. r = 0.85
34. r = +0.58
37. r = +0.68
40. r = +0.1
43. r = +0.533
46. r = +0.62
49. r = 0.34 32. y = 6.25.
35. r = +0.98
38. r =  0.92
41. r = +0.98
44. r = +0.596
47. r =  0.93
50. r = 0.679 217 9. REGRESSION
9.1 Introduction:
After knowing the relationship between two variables we
may be interested in estimating (predicting) the value of one
variable given the value of another. The variable predicted on the
basis of other variables is called the “dependent” or the ‘ explained’
variable and the other the ‘ independent’ or the ‘ predicting’ variable.
The prediction is based on average relationship derived statistically
by regression analysis. The equation, linear or otherwise, is called
the regression equation or the explaining equation.
For example, if we know that advertising and sales are
correlated we may find out expected amount of sales for a given
advertising expenditure or the required amount of expenditure for
attaining a given amount of sales.
The relationship between two variables can be considered
between, say, rainfall and agricultural production, price of an input
and the overall cost of product, consumer expenditure and
disposable income. Thus, regression analysis reveals average
relationship between two variables and this...
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This note was uploaded on 01/18/2014 for the course BUS 100 taught by Professor Moshiri during the Winter '08 term at UC Riverside.
 Winter '08
 Moshiri
 Business

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