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1.the regression equations of 2 variables x and y are x+2y=7 and 2x-y=4. the n the mean X and mean Y
are:
a) (3,2)
b) (1,3)
c) (4,4)
d) (0.5,0.6)
also another question:
2.the regression coefficients of regression eqns are -a and -b where a and b are positiv fractional values, then the correlation coefficient is
a) (a+b)/2
b) (a-b)/2
c) -c (fractional value)
d) c (fractional value)
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