MULTIPLE CHOICE TYPE QUESTIONS FOR PRACTICE
F.Y.B.COM
DIVS :-
A, B, C : SEM-II
STATISTICAL-TECHNIQUES: 2013-14
UNIT: III :
BIVARIATE
LINEAR CORRELATION
&
REGRESSION
Q.1.The method used to derive regression constants of a
regression equation is known as ……………………
(A) product moment
(B) least squares
(C) large squares
(D) none of these
Q.2.The value of correlation coefficient is-----------of the two
regression coefficients.
(A) arithmetic Mean
(C) harmonic Mean
(B) geometric Mean
(D) none of these
Q.3.If the two regression coefficients are positive , the value of the
correlation coefficients must be ……………………… .
(A) negative
(C) zero
(B) positive
(D)any of these
Q.4.For 10 pairs of x and y values, the regression coefficients byx ,
bxy can be …………………………………………..
(A)1.2 and 0.8
(B)1.2 and 1.1
(C)1.2 and -0.2
(D)none of these
Q.5.If the two regression coefficients are byx = 3 , bxy = 1/3 , the
correlation coefficient is ………………………………
(A) 0
(B) +1
(C) -1
(D)none of these
Q.6.If the regression equation of x and y is 2x + 7y = 135 , the
estimated value of x when y = 17 is ……………………………………..
(A) 8
(B) 10
(C) 5
(D)none of these
Q.7. If two variables x and y are highly correlated then y can be
estimated for a given value of x using ……………
(A) pearson’s coefficient of correlation (B) regression equation of
y on x (C) regression equation of x on y
(D) none of these
Q.8.Identify the triplet of numbers representing values of the
two regression coefficients and correlation coefficients
respectively.
(A) 1.5 , 1.5, 1.5
(B)1, 1, 1
(C)0.5 , -0.5 , 0.5
(D)0.4 , 1.6 , -0.8
Q.9. If the values obtained from 10 pairs of x and y are :bxy = 2,
r = 1/3 , s.d of x = 3, then s.d of y is ………………….
(A) 0.5
(B) 2
(C) 1
(D) none of these
Q.10.If the values of regression coefficients are 0.7 each, then the
value of correlation coefficient is ……………….
(A) -0.7
(B) 0.7
(C) 0.35
(D) none of these
Q.11.The value of correlation coefficient is always ……………………
(A) more than zero (B) more than 1 (C)morethan-2(D)none of these
Q.12. If the value of pearson’s coefficient of correlation is 0.93,
it can be concluded that there is ………………………………..
(A) high degree of positive correlation (B) absence of correlation
(C) perfect negative correlation
(D) none of these
Q.13.For 10 pairs of distinct observation , if ∑ 𝒅 2 = 33 , the
value of rank correlation coefficient is
(A) 0.8
(B) 0.2
(C) 0.4
(D) none of these
Q.14.If the variables x and y are measured in cms and gms
respectively , then coefficient of correlation is measured in
(A) cms
(B) gms
(C) cms-gms
(D) none of these
Q.15.The diagram of n pairs of (x,y) values used to get rough idea
about relationship between variables x and y is known as..
(A) scatter diagram(B) histogram(C) pie-diagram(D) none of these
Q.16. While calculating rank correlation coefficient , If the values
of variable x are ranked in increasing order , then values of
variable y must be ranked in
(A) increasing order
(C) increasing or decreasing order
(B) decreasing order
(D) none of these
Q.17.The value of PEARSON’S COEFFICIENT of correlation
between marks of 10 students and number of passengers in
10 trains is obtained as 0.94.It can be concluded that the
type of correlation between them is ………………….
(A) positive correlation
(B) spurious or fake correlation
(C) negative correlation
(D) none of these
Q.18.If 2 (two ) values of variable x are identical, the value of
the correlation factor to be used in correlation coefficient is
(A) 2
(B) 0.5
(C) 3
(D) none of these
Q.19.The correlation between number of students passing and
sales of sweets in april-june 2011 is …………
(A) positive
(B) negative
(C) zero
(D) none of these
Q.20.The contestants in a beauty contest are judged by 2 eminent
personalities from different fields. Which measure of
correlation will be best suited to find relationship between
their judgement ?
(A) pearson’s coefficient
(B) rank correlation coefficient
(C) scatter diagram
(D) none of these
Q.21.The number of years of service and the salary in Rs. Of 16
employes is given. Which type of correlation will be found
in the above example?
(A) negative
(B) positive
(C) spurious
(D) none of these
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