If the values of two variables move in opposite direction then the correlation is said to be ______.

(a)

Negative

(b)

Positive

(c)

Perfect positive

(d)

No correlation

If r(X,Y) = 0 the variables X and Y are said to be ______.

(a)

Positive correlation

(b)

Negative correlation

(c)

No correlation

(d)

Perfect positive correlation

From the following data, N = 11, ΣX = 117, ΣY = 260, ΣX² = 1313, ΣY² = 6580, ΣXY = 2827 the correlation coefficient is ________.

(a)

0.3566

(b)

-0.3566

(c)

0

(d)

0.4566

The variable whose value is influenced (or) is to be predicted is called ________.

(a)

dependent variable

(b)

independent variable

(c)

regressor

(d)

explanatory variable

The correlation coefficient ________.

(a)

r = ±\(\sqrt { { b }_{ xy }\times { b }_{ yx } } \)

(b)

r = \(\frac { 1 }{ { b }_{ xy }\times { b }_{ yx } } \)

(c)

r = b_xy x b_yx

(d)

r = ±\(\sqrt { \frac { 1 }{ { b }_{ xy }\times { b }_{ yx } } } \)