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Question
If the values of two variables move in same direction then the correlation is said to be
Options
Negative
Positive
Perfect positive
No correlation
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Solution
Positive
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In the following data one of the value of y is missing. Arithmetic means of x and y series are 6 and 8 respectively. `(sqrt(2) = 1.4142)`
| x | 6 | 2 | 10 | 4 | 8 |
| y | 9 | 11 | ? | 8 | 7 |
Estimate missing observation.
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| Number of pairs of observation | 15 | 15 |
| Arithmetic mean | 25 | 18 |
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| X | 78 | 89 | 96 | 69 | 59 | 79 | 68 | 62 |
| Y | 121 | 72 | 88 | 60 | 81 | 87 | 123 | 92 |
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