Correlation Test

Result

Correlation Test - 17

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

The defects of rank correlation is/are_______________.

A
the original values are taken

B
the original values are not taken

C
it becomes tedious to calculate if number exceeds 30

D
both (B) and (C)

Solution

Rank correlation is the technique in which ranks are provided to the data after sorting it so sometimes, it becomes very difficult to assign ranks if the variables are large in numbers and also in this, ranks are taken inspite of original values.
Question 2
1 / -0

Karl Pearson's method is popularly known as ______________.

A
concurrent deviation method

B
correlation co-efficient

C
technical co-efficient

D
rank correlation

Solution

Karl Pearson's method is known as correlation coefficient as it measures the degree of relationship between two variables and its value ranges between +1 to -1.
Question 3
1 / -0

Correlation is said to be simple when_____________.

A
more than two variables are studied

B
only two variables are studied

C
only one variable is studied

D
the value of two variables move in the opposite direction

Solution

Simple linear correlation is a measure of the degree of strength of association between two variables i.e. how strongly they are connected with each other.
Question 4
1 / -0

Coefficient of Correlation is:

A
Always positive

B
Always negative

C
Positive as well as negative

D
Always Zero

Solution

Correlation coefficients are expressed as values between 1 and +1. A coefficient of +1 indicates a perfect positive correlation: A change in the value of one variable will predict a change in the same direction in the second variable. A coefficient of 1 indicates a perfect negative correlation: A change in the value of one variable predicts a change in the opposite direction in the second variable. Hence, correct answer is option C.

Question 5

1 / -0

If the letter of the word $$SCHOOL$$ are arranged as per dictionary then rank of the word $$SCHOOL$$ is

$$303$$

$$301$$

$$302$$

$$304$$

Solution

Find rank of the world 'SCHOOL'

5 S $$\frac{5}{2!}$$ $$\times $$ 5!	1 C $$\frac{0}{2!}$$ $$\times $$ 4!	2 H $$\frac{0}{2!}$$ $$\times $$ 3!	4 O $$\frac{1}{2!}$$ $$\times $$ 2!	4 O $$\frac{1}{2!}$$ $$\times $$ 1!	3 L $$\frac{0}{2!}$$ $$\times $$ 0!
300	0	0	1	1	0

300+0+0+1+1+0=302

302+1=303

i.e, Rank of the world 'SCHOOL' = 303

Question 6
1 / -0

$$Which\,of\,the\,following\,is\,always\,true\,?$$

A
$$1)\,\left( {p \to q} \right) \cong \left( { \sim q \to \sim p} \right)$$

B
$$2) \sim \left( {p \vee q} \right) \cong \left( { \sim p \vee \sim q} \right)$$

C
$$3) \sim \left( {p \to q} \right) \cong \left( {p \vee \sim q} \right)$$

D
$$4) \sim \left( {p \wedge q} \right) \cong \left( { \sim p \wedge q} \right)$$
Question 7
1 / -0

The average age of $$12$$ children is $$20$$ years. If the age of one more child is added, the average is decreased by $$1$$. What is the age of the child added later ?

A
$$9$$ years

B
$$8$$ years

C
$$7$$ years

D
$$6$$ years

Solution

Let the age of child added later be $$x$$ years.
average age of $$12$$ children $$= 20 \text{ years}$$
$$\therefore$$ Total age of $$12$$ children $$= 20 \times 12 = 240 \text{ years}$$
After one more child is added-
Average of $$13$$ children $$= 20 - 1 = 19 \text{ years}$$
Average age of $$13$$ children $$= \cfrac{\text{sum of 12 children} + x}{13}$$
$$19 = \cfrac{240 + x}{13}$$
$$\Rightarrow 240 + x = 247$$
$$\Rightarrow x = 247 - 240 = 7 \text{ years}$$
Hence the age of child added later is $$7$$ years.
Question 8
1 / -0

Which of the following is NOT true with respect to Correlation?

A

Correlation can be expressed graphically

B

Correlation cannot be obtained using all type of series

C

Correlation can be obtained through ranks

D

Correlation can be positive, negative and zero, but never be less than one

Solution

In statistics, correlation (r) or dependence is any statistical relationship, whether causal or not, between two random variables or bivariate data. In the broadest sense correlation is any statistical association, though it commonly refers to the degree to which a pair of variables are linearly related. Correlation ranges : -1 ≤ r ≤ +1. Correct answer is option D.
Question 9
1 / -0

Calculate the coefficient of correlation from following data:
Summation of products of deviation from their respective means of X and Y = 4880, SDX = 28.70, SDy = 18.02, N = 10.

A
0.74

B
0.84

C
0.94

D
None of the above

Solution

Given that, Summation of products of deviation from their respective means of X and Y = 4880, SDX = 28.70, SDy = 18.02, N = 10. Hence, correct answer is option C.
Question 10
1 / -0

The coefficient of rank correlation of marks obtained by 10 students in English and Economics was to be fount 0.5. It was later discovered that the difference in ranks in the two subjects obtained by one of the students was wrongly taken as 3 instead of 7. Find correct coefficient of rank correlation.

A
122.5

B
132.7

C
142.3

D
145.6

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Correlation Test - 17

Result

Correlation Test - 17

Score

-

Rank

-

SHARING IS CARING

Question 1

the original values are taken

the original values are not taken

it becomes tedious to calculate if number exceeds 30

both (B) and (C)

Solution

Question 2

concurrent deviation method

correlation co-efficient

technical co-efficient

rank correlation

Solution

Question 3

more than two variables are studied

only two variables are studied

only one variable is studied

the value of two variables move in the opposite direction

Solution

Question 4

Always positive

Always negative

Positive as well as negative

Always Zero

Solution

Question 5

$$303$$

$$301$$

$$302$$

$$304$$

Solution

Question 6

$$1)\,\left( {p \to q} \right) \cong \left( { \sim q \to \sim p} \right)$$

$$2) \sim \left( {p \vee q} \right) \cong \left( { \sim p \vee \sim q} \right)$$

$$3) \sim \left( {p \to q} \right) \cong \left( {p \vee \sim q} \right)$$

$$4) \sim \left( {p \wedge q} \right) \cong \left( { \sim p \wedge q} \right)$$

Question 7

$$9$$ years

$$8$$ years

$$7$$ years

$$6$$ years

Solution

Question 8

Correlation can be expressed graphically

Correlation cannot be obtained using all type of series

Correlation can be obtained through ranks

Correlation can be positive, negative and zero, but never be less than one

Solution

Question 9

0.74

0.84

0.94

None of the above

Solution

Question 10

122.5

132.7

142.3

145.6

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.