# Practice Test: Question Set - 01

**1. The resultant population is normally distributed,**

- (A) When
populations of two normally distributed random variables are added

- (B) When
populations of two normally distributed random variables are subtracted

- (C) When
populations of two normally distributed random variables are multiplied

- (D) Any
one of above

**2. Dispersion of population is**

- (A) Spread
of data or extend to which the observations are scattered

- (B) Midpoint
of distribution where most of the data cluster

- (C) Concentration
of data at either low or high end

- (D) Distribution
with sharp peak

**3. Standard deviation is**

- (A) Square
of standard variable

- (B) Arithmetic
mean

- (C) Root
mean square deviation from the mean

- (D) Deviation
from mean in units of standard deviation

**4. When population**

*Y*with means*Î¼*_{Y }is subtracted from population*X*with mean*Î¼*_{X}, the mean of resultant population is given by,- (A)

*Î¼*

_{X}+

*Î¼*

_{Y}

- (B)

*Î¼*

_{X}-

*Î¼*

_{Y}

- (C)

*Î¼*

_{X}

*Î¼*

_{Y}

- (D)

*Î¼*

_{X}/

*Î¼*

_{Y}

**5. Histogram is**

- (A) A
set of rectangles

- (B) A
line graph of class frequency plotted against class marks

- (C) A
bell shaped smooth curve

- (D) None
of the above

**6. The area below normal curve from (Z = -1) to (Z = +1) is**

- (A) 1

- (B) 0.6827

- (C) 0.9545

- (D) 0.9973

**Where, Z is
standard variable**

**7. When two populations with means**

*Î¼*_{X}and*Î¼*_{Y}are added, the mean of resultant population is given by,- (A)

*Î¼*

_{X}+

*Î¼*

_{Y}

- (B)

*Î¼*

_{X}-

*Î¼*

_{Y}

- (C)

*Î¼*

_{X}

*Î¼*

_{Y}

- (D)

*Î¼*

_{X}/

*Î¼*

_{Y}

**8. Frequency polygon is**

- (A) A set of
rectangles

- (B) A
line graph of class frequency plotted against class marks

- (C) A
bell shaped smooth curve

- (D) None
of the above

**9. When population**

*X*with mean*Î¼*_{X}, is divided by population Y with mean*Î¼*_{Y}, the mean of resultant population is given by,- (A)

*Î¼*

_{X}+

*Î¼*

_{Y}

- (B)

*Î¼*

_{X}-

*Î¼*

_{Y}

- (C)

*Î¼*

_{X}

*Î¼*

_{Y }

- (D)

*Î¼*

_{X}/

*Î¼*

_{Y}

**10. Central tendency of population is measured in units of**

- (A) Standard
deviation

- (B) Arithmetic
mean

- (C) Standard
variable

- (D) Square
of standard deviation

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