The regression lines are identical if r is equal to
The regression lines are perpendicular to each other if r is equal to
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Feature of Least Square regression lines are——— The sum of the deviations at the Y’s or the X’s from their regression lines are zero.
The coefficient of determination is defined by the formula
The line Y = 13 –3X /2 is the regression equation of
The line X = 31/6 — Y/6 is the regression equation of
In the equation X = 35/8 – 2Y/5, bxy 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
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
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 ‘Insurance companies’ profits and the no of claims they have to pay “——
In case ‘Amount of rainfall and yield of crop’——
For calculation of correlation coefficient, a change of origin is
The relation rxy = cov (x,y)/sigma x* sigma y is
A small value of r indicates only a _________ linear type of relationship between the variables.