Q1.
If r = 0.6 , then the value of coefficient of determination is ____________ .
Solution.
0.36
Note : If r is correlation coefficient then coefficient of determination is r2 .
Solution
Q2.
If r = 0 , then both regression lines will be ____________ .
Perpendicular .
Solution
Q3.
byx denotes regression coefficient y on x
(a) true (b) false (c) can't say (d) none of these
Solution.
true
Solution
Q4.
If r holds negative sign then bxy holds ___________ sign .
Solution.
Negative sign .
Note : All the three coefficient have same sign (two regression coefficients and correlation coeffi
cient).
Solution
Q5.
If r = 1 , it means the two judges are
(a) completely agree (b) completely disagree (c) partially agree (d)
partially disagree
Solution.
(a) completely agree
Solution
Q6.
The geometric mean of both regression coefficient gives us ______________
Solution.
correlation coefficient
Solution
Q7.
The intersection point of two regression lines gives us ______________ .
Solution.
Mean of x and y
Solution
Q8.
If scatter diagram of two variables shows movement from lower left two upper right then it shows __________ correlation .
Solution.
Positive
Solution
Q9.
Unemployment index and purchasing power is the example of ____________ correlation .
Solution.
Negative .
Solution
Q10.
Change of origin impacts on correlation coefficient
(a) yes (b) no (c) can't say (d) none of these
Solution.
no
Solution
