Statistical Consideration in Mechanical Machine Design MCQ - Set 02 - ObjectiveBooks
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# 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 μX and μY are multiplied, the mean of resultant population is given by,
(A) μX + μY
(B) μX - μY
(C) μX μY
(D) μX/μY

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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