Test: Correlation And Regression- 3

The coefficient of determination is defined by the formula

The line Y = 13 –3X /2 is the regression equation of

In the line Y = 19 – 5X/2 , b_yx is equal to

The line X = 31/6 — Y/6 is the regression equation of

In the equation X = 35/8 – 2Y/5, b_xy is equal to

The square of coefficient of correlation ‘r’ is called the coefficient of

A relationship r² = 1 — ⁵⁸⁰ is not possible ³⁰⁰

Whatever may be the value of r, positive or negative, its square will be

Simple correlation is called

A scatter diagram indicates the type of correlation between two variables.

If the pattern of points ( or dots) on the scatter diagram shows a linear path diagonally across the graph paper from the bottom left- hand corner to the top right, correlation will be

The correlation coefficient being +1 if the slope of the straight line in a scatter diagram is

The correlation coefficient being –1 if the slope of the straight line in a scatter diagram is

The more scattered the points are around a straight line in a scattered diagram the _______ is the correlation coefficient.

If the values of y are not affected by changes in the values of x, the variables are said to be

If the amount of change in one variable tends to bear a constant ratio to the amount of change in the other variable, then correlation is said to be

Variance may be positive, negative or zero.

Covariance may be positive, negative or zero.

Correlation coefficient between x and y = correlation coefficient between u and v

In case ‘ The ages of husbands and wives’ ———— correlation is

In case ‘Shoe size and intelligence’

In case ‘Insurance companies’ profits and the no of claims they have to pay “——

In case ‘Years of education and income’———

In case ‘Amount of rainfall and yield of crop’——

For calculation of correlation coefficient, a change of origin is

The relation r_xy = cov (x,y)/sigma x_* sigma y is

A small value of r indicates only a _________ linear type of relationship between the variables.

Two regression lines coincide when

Neither y nor x can be estimated by a linear function of the other variable when r is equal to

When r = 0 then cov (x,y) is equal to

When the variables are not independent, the correlation coefficient may be zero

b_xy is called regression coefficient of

b_yx is called regression coefficient of

The slopes of the regression line of y on x is

The slopes of the regression line of x on y is

The angle between the regression lines depends on

If x and y satisfy the relationship y = –5 + 7x, the value of r is