Problem 1
The median of the numbers \(11,10,12,13,9\) is (a) \(12.5\) (b) 12 (c) \(10.5\) (d) 11 .
Problem 2
The mode of the numbers \(7,7,7,9,10,11,11,11,12\) is (a) 11 (b) 12 (c) 7 (d) 7 and 11 .
Problem 4
Coefficient of variation is (a) \(\frac{\sigma}{x} \times 100\) (b) \(\frac{\sigma}{x}\) (c) \(\sqrt{\frac{\sigma^{2}}{x}} \times 100 .\)
Problem 5
Average scores of three batiman \(A, B, C\) are respectively 40,45 and 56 and their S.D.n are rerpectively 9, 11,16 , Which bateman is more consirtent? (a) \(\mathbf{A}\) (b) \(\underline{B}\) (c) \(C\).
Problem 6
The equations of regresuion lines are \(y=0.5 x+a\) and \(x=0.4 y+b\), The correlation coefficient is (a) \(\sqrt{0.2}\) (b) \(0.46\) (c) \(-\sqrt{0.2}\).
Problem 7
If the correlation coethcient is 0 , the two regression lines are (o) parallel (b) perpendicular (c) coincident. (d) inclined at \(45^{\circ}\) to each other.
Problem 9
Regression coefficient of \(y\) on \(x\) is \(0.7\) and that of \(x\) on \(y\) is 3.2. Is the correlntion coefficient \(r\) consistent ?
Problem 10
The standard deviation of the numbers \(24,48,64,36,83\) is ........
Problem 12
If the two regression lines are perpendicular to each ether, then their coeflicient of correlation is.
Problem 14
The minimum value of correlation coefficient is \(\ldots \ldots .\)
