JEE Questions for Maths Statistics Quiz 8

0%
0%
2)
0%
0%

If regression coefficient of y on x is 0.40, then the regression coefficient of x on y will be

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1.6
0%
6.4
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5.1
0%
3.2

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0%
2)
0%
0%

0%
0%
2)
0%
0%

0%
0%
2)
0%
0%

If the coefficient of correlation is positive, then the regression coefficients

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Both are positive
0%
Both are negative
0%
One is positive and another is negative
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None of the above

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0
0%
–1
0%
1
0%
None of these

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0.289
0%
–0.289
0%
0.209
0%
None of these

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0%
2)
0%
0%

If the two regression coefficient between x and y are 0.8 and 0.2, then the coefficient of correlation between them is

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0.4
0%
0.6
0%
0.3
0%
0.5

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0%
2)
0%
0%

If the angle between the two lines of regression is 90°, then it represents

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Perfect correlation
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Perfect negative correlation
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No linear correlation
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None of the above

Which of the following two sets of regression lines are the true representative of the information from the bivariate population?

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Both I and II
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II only
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I only
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None of these

The coefficient of correlation between two variable x and y is given by

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0%
2)
0%
0%

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0.8
0%
0.6
0%
0.5
0%
– 0.8

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a is positive
0%
b is positive
0%
a and b both are positive
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a and b are of opposite sign

The coefficient of correlation between x and y is 0.6, then covariance is 16. Standard deviation of x is 4, then the standard deviation of y is

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5
0%
10
0%
20/3
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None of these

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0%
2)
0%
0%
None of these

If acute angle between the two regression lines is θ, then

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0%
2)
0%
0%

0%
0%
2)
0%
0%

0%
0%
2)
0%
0%
None of these

If the lines of regression of y on x and x on y make angles 30° and 60° respectively with the positive direction of x-axis, then the correlation coefficient between x and y is

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0%
2)
0%
0%

0%
0.6; 16
0%
0.16; 16
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0.3; 4
0%
0.6; 4

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0%
2)
0%
0%
None of these

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–3.1
0%
–3.2
0%
–3.3
0%
–3.4

Let X, Y be two variables with correlation coefficient ρ(X, Y) and variables U, V be related to X, Y by the relation U = 2X, V = 3Y, then ρ(U, V) is equal to