The regression equation of y on x and that of x on y are
8x −10y + 66 = 0
and 40x −18y = 214 respectively, and the variance of x is 9.
calculate the variance of y?
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8x-10y=- 66
40x-18y=214
then x=9
8x9-10y=-66
72-10y=-66
-10y=-66-72
-10y=-138
both are negative sign
then
10y=138
40x-18 y=214
40x9-18y=214
360-18 y=214
-18 y=214-360
-18 y=-146
again both are negative then
18 y=146
equality
10y=138
18y=146
then
y= 138/10and
Y=146/18
40x-18y=214
then x=9
8x9-10y=-66
72-10y=-66
-10y=-66-72
-10y=-138
both are negative sign
then
10y=138
40x-18 y=214
40x9-18y=214
360-18 y=214
-18 y=214-360
-18 y=-146
again both are negative then
18 y=146
equality
10y=138
18y=146
then
y= 138/10and
Y=146/18
70ny:
can u tell y u applied this method ?...i mean on what base u think it will be the solution
becaue in this question only give x value and we will find out y value thats why i will think thats its ans if you think its wrong then sorry for that
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