ECAT Statistics Test Set 14

If the correlation coefficient r = 0, the two regression lines are:

If x and y are independent variables, then the two lines of regression are:

If the two regression coefficients are 0.8 and 0.2, then coefficient of correlation r is:

The two regression lines are identical if:

If r between the lines of regressions of x on y and y on x, is ±1, then:

If the equations of regression lines are y = 0.5x + a and x = 0.5y + b and xˉ=10\bar{x} = 10xˉ=10, yˉ=12\bar{y} = 12yˉ​=12, then the values of a and b are respectively:

If r = 1 or -1, the regression lines are:

If r = 0, then:

If the sum of the product of deviations of x and y series from their means is zero, the correlation coefficient will be:

The two regression lines are perpendicular to each other if:

The purpose of simple linear regression analysis is to: