MCQ 11 Mark
Which of the following values is not possible as a value of $r\ ?$
- A$0.99$
- ✓$-1.07$
- C$-0.85$
- D$0$
Answer
View full question & answer→Correct option: B.
$-1.07$
Questions
MCQ
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26 questions · timed · auto-graded
MCQ 21 Mark
What does the numerator indicate in the formula for calculating the correlation coefficient by Karl Pearson’s method ?
- AProduct of variance of $X$ and $Y$
- ✓Covariance of $X$ and $Y$
- CVariance of $X$
- DVariance of $Y$
Answer
View full question & answer→Correct option: B.
Covariance of $X$ and $Y$
MCQ 31 Mark
Which kind of the correlation can be obtained if the two variables are varying in opposite direction in constant proportion ?
- APerfect Positive correlation
- ✓Partial Positive correlation
- CPerfect Negative correlation
- DPartial Negative correlation
Answer
View full question & answer→Correct option: B.
Partial Positive correlation
MCQ 41 Mark
The measurement unit of a variable ‘Weight’ is kg. and that of ‘Height’ is cm. What can you see about the measurement unit of the correlation coefficient between them ?
- Akg
- Bcm
- Ckm
- ✓does not have any unit
Answer
View full question & answer→Correct option: D.
does not have any unit
MCQ 51 Mark
What is the range of the correlation coefficient $r ?$
- A$-1 < r < 1$
- B$0$ to $1$
- ✓$– 1 ≤ r ≤ 1$
- D$ – 1$ to $0$
Answer
View full question & answer→Correct option: C.
$– 1 ≤ r ≤ 1$
MCQ 61 Mark
Which kind of the correlation exists if the following scatter diagram is of two variables $X$ and $Y ?$
- APerfect Positive correlation
- BPartial Positive correlation
- CPerfect Negative correlation
- ✓Partial Negative correlation
Answer
View full question & answer→Correct option: D.
Partial Negative correlation
MCQ 71 Mark
Which kind of the correlation exists if the following scatter diagram is of two variables $X$ and $Y ?$
- ✓Perfect Positive Correlation
- BPartial Positive Correlation
- CPerfect Negative Correlation
- DPartial Negative Correlation
Answer
View full question & answer→Correct option: A.
Perfect Positive Correlation
MCQ 81 Mark
Which kind of correlation will you get between the number of units sold and its revenue at constant price ?
- ✓Perfect Positive
- BPartial Positive
- CPerfect Negative
- DPartial Negative
Answer
View full question & answer→Correct option: A.
Perfect Positive
MCQ 91 Mark
In usual notations, which term is added in $\sum d ^2$ for each repeated observation in the rank correlation ?
- A$\frac{m^2-1}{12}$
- ✓$\frac{m^3-m}{12}$
- C$\frac{6 m^3-m}{12}$
- D$n\left(n^2-1\right)$
Answer
View full question & answer→Correct option: B.
$\frac{m^3-m}{12}$
MCQ 101 Mark
In the method of rank correlation, if the ranks of two variables are exactly in reverse order, then what is the value of $r ?$
- A$r = 0$
- ✓$r = – 1$
- C$r = 1$
- D$r = 0.1$
Answer
View full question & answer→Correct option: B.
$r = – 1$
MCQ 111 Mark
In the method of rank correlation, what is the sum of differences of the ranks of two variables ?
- ✓$0$
- B$– 1$
- C$1$
- DAny real number
Answer
View full question & answer→Correct option: A.
$0$
MCQ 121 Mark
In the method of rank correlation, in usual notations if $Rx = Ry$ for each pair of observations then what is the value of the $r ?$
- A$0$
- B$-1$
- ✓$1$
- D$0.1$
Answer
View full question & answer→Correct option: C.
$1$
MCQ 131 Mark
What is the value of the rank correlation coefficient if $\sum d^2 = 0 ?$
- A$0$
- B$-1$
- ✓$1$
- D$0.5$
Answer
View full question & answer→Correct option: C.
$1$
MCQ 141 Mark
If $r(-x, y) = 0.5$ then what is the value of $r(x, -y) ?$
- A$0.5$
- ✓$-0.5$
- C$1$
- D$0$
Answer
View full question & answer→Correct option: B.
$-0.5$
MCQ 151 Mark
If $r(x, y) = 0.7$ then what is the value of $r(x + 0.2, y + 0.2) ?$
- ✓$0.7$
- B$0.9$
- C$1.1$
- D$-0.7$
Answer
View full question & answer→Correct option: A.
$0.7$
MCQ 161 Mark
If $u =\frac{x- A }{ C _x}$ and $v =\frac{y-B}{C_y}, C _{ x }>0, C _{ y }>0$, then which of the following statement is correct ?
- A$r (x, y) \neq r (u, v)$
- B$r (x, y) > r (u, v)$
- ✓$r(x, y) = r (u, v)$
- D$r (x, y) < r(u, v)$
Answer
View full question & answer→Correct option: C.
$r(x, y) = r (u, v)$
MCQ 171 Mark
In context with correlation, what do you call the graph, if the points or paired observation $(x, y)$ are shown in a graph $?$
- AHistogram
- BCircle diagram
- ✓Scatter diagram
- DFrequency curve
Answer
View full question & answer→Correct option: C.
Scatter diagram
MCQ 181 Mark
Which type of measurement is correlation co-efficient?
- ✓Absolute
- BAverage
- CRelative
- DRatio
Answer
View full question & answer→Correct option: A.
Absolute
MCQ 191 Mark
What is the value of $r,$ if all the points plotted in a scatter diagram lie on a single line only ?
- A$0$
- ✓$1$ or $– 1$
- C$0.5$
- D$– 0.5$
Answer
View full question & answer→Correct option: B.
$1$ or $– 1$
MCQ 201 Mark
How many methods are there to study correlation?
- ATwo
- ✓Three
- CFour
- DFive
Answer
View full question & answer→Correct option: B.
Three
MCQ 211 Mark
In the method of rank correlation, in usual notations if $R_{x} = R_{y}$ for each pair of observations then what is the value of the r ?
- A$0$
- B-1
- ✓1
- D0.1
Answer
View full question & answer→Correct option: C.
1
C
MCQ 221 Mark
What is the value of the rank correlation coefficient if $\sum d^{2}=0$ ?
- A$0$
- B-1
- ✓1
- D0.5
Answer
View full question & answer→Correct option: C.
1
C
MCQ 231 Mark
In the method of rank correlation, what is the sum of difference of the ranks of two variables ?
- ✓$0$
- B- 1
- C1
- DAny real number
Answer
View full question & answer→Correct option: A.
$0$
A
MCQ 241 Mark
What is the value of r, if all the points - plotted in the scatter diagram lie on a single straight line only ?
- A$0$
- ✓1 or - 1
- C0.5
- D-0.5
Answer
View full question & answer→Correct option: B.
1 or - 1
B
MCQ 251 Mark
What is the value of the rank correlation coefficient if sum of squares of difference in the ranks $\Sigma d^{2}=0$ ?
- A$0$
- B-1
- ✓1
- D0.5
Answer
View full question & answer→Correct option: C.
1
C
MCQ 261 Mark
Which of the following values is not possible as a value of correlation coefficient ?
- A0.99
- ✓-1.07
- C-0.85
- D$0$
Answer
View full question & answer→Correct option: B.
-1.07
B