# Practice Test: Question Set - 02

**1. Dispersion of population is measured in units of**

- (A) Standard
deviation

- (B) Arithmetic
mean

- (C) Geometric
mean

- (D) Square
of standard deviation

**2. The area below normal curve from (Z = -2) to (Z = +2) is**

- (A) 1

- (B) 0.6827

- (C) 0.9545

- (D) 0.9973

**Where, Z is
standard variable**

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

- (A) 1

- (B) 0.6827

- (C) 0.9545

- (D) 0.9973

**Where, Z is
standard variable**

**4. Central tendency 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

**5. When two populations with means**

*Î¼*_{X}and*Î¼*_{Y}are multiplied, 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}

**6. Standard variable is**

- (A) Square
of standard deviation

- (B) Arithmetic
mean

- (C) Root
mean square deviation from the mean

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

**7. The area below normal curve from (Z = -3) to (Z = +3) is**

- (A) 1

- (B) 0.6827

- (C) 0.9545

- (D) 0.9973

**Where, Z is standard variable**

**8. Skewness 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

**9. The reliability of ball bearing selected from manufacture’s catalogue is**

- (A) 90 %

- (B) 50 %

- (C) 99 %

- (D) More than 90
%

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