Statistics Test

Result

Statistics Test - 5

Score
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out of -
Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

If the variance of the data is V, then its S.D. is

A
√V

B
V²

C
±√V

D
- √V

Solution

standard deviation have the same units as the data but variance is mean of the square of differences.
Question 2
1 / -0

If mean = ( 3 median – mode ) x , then the value of x is

A
1/ 2

B
1

C
2

D
3/ 2

Solution

We know that, 3median = mode + 2 mean

so, mean= (3 median - mode)/2 ........(1)

comparing equation(1) with the given equation

therefore, x=1/2
Question 3
1 / -0

Least square lines of regression give best possible estimates , when ρ(X,Y) is equal to

A
- 1 or 1

B
1/ 2

C
greater than -1

D
less than 1

Solution

Least square lines of regression give best possible estimates when the lines coincide at that point ρ = ± 1
Question 4
1 / -0

Quartile deviation is nearly equal to

A
2 σ

B
3/ 2 σ

C
2/ 5 σ

D
2/ 3 σ

Solution

Quartile deviation Q₃ − Q₁/2 is approximately 2/3 times the standard deviation.