Deck 1: Measures of Central Tendency and Operations Research

Question 1

Any measure indicating the centre of a set of data, arranged in an increasing or decreasing order of magnitude, is called a measure of

A)Skewness
B)Symmetry
C)Central tendency
D)Dispersion

Answer 1

Central tendency

Question 2

Scores that differ greatly from the measures of central tendency are called:

A)Raw scores
B)The best scores
C)Extreme scores
D)Z-scores

Answer 2

Extreme scores

Question 3

The measure of central tendency listed below is:

A)The raw score
B)The mean
C)The range
D)Standard deviation

Answer 3

The mean

Question 4

While computing the arithmetic mean of a frequency distribution, the each value of a class is considered equal to:

A)Class mark
B)Lower limit
C)Upper limit
D)Lower class boundary

Question 5

The sum of the squares fo the deviations about mean is:

A)Zero
B)Maximum
C)Minimum
D)All of the above

Question 6

For a certain distribution, if ?(X -20) = 25, ?(X- 25) =0, and ?(X-35) = -25, then is equal to:

A)20
B)25
C)-25
D)35

Question 7

The sum of the squares of the deviations of the values of a variable is least when the deviations are measured from

A)Harmonic mean
B)Geometric mean
C)Median
D)Arithmetic mean

Question 8

If X1, X2, X3, ... Xn, be n observations having arithmetic mean and if Y =4X ± 2, then is equal to:

A)4X
B)4
C)4 ± 2
D)4 ± 2.

Question 9

If =100 and Y=2X - 200, then mean of Y values will be:

A)0
B)2
C)100
D)200

Question 10

If the arithmetic mean of 20 values is 10, then sum of these 20 values is:

A)10
B)20
C)200
D)20 + 10

Question 11

Ten families have an average of 2 boys. How many boys do they have together?

A)2
B)10
C)12
D)20

Question 12

If the arithmetic mean of the two numbers X1 and X2 is 5 if X1=3, then X2 is:

A)3
B)5
C)7
D)10

Question 13

We must arrange the data before calculating:

A)Mean
B)Median
C)Mode
D)Geometric mean

Question 14

The lower and upper quartiles of a symmetrical distribution are 40 and 60 respectively. The value of median is:

A)40
B)50
C)60
D)(60 - 40) / 2

Question 15

If in a discrete series 75% values are greater than 50, then:

A)Q1 = 50
B)Q1 < 50
C)Q1 > 50
D)Q1 ? 50

Question 16

Suitable average for averaging the shoe sizes for children is

A)Mean
B)Mode
C)Median
D)Geometric mean

Question 17

A measurement that corresponds to largest frequency in a set of data is called:

A)Mean
B)Median
C)Mode
D)Percentile

Question 18

Which of the following average cannot be calculated for the observations 2, 2, 4, 4, 6, 6, 8, 8, 10, 10 ?

A)Mean
B)Median
C)Mode
D)All of the above

Question 19

What have been constructed from OR problems and methods for solving the models that are available in many cases?

A)Scientific models
B)Algorithms
C)Mathematical models
D)None of these

Question 20

Which of the following is not the phase of OR methodology?

A)Formulating a proble
B)Constructing a model
C)Establishing controls
D)Controlling the environment

Question 21

Operations research is the application of methods to arrive at the optimal solutions to the problems.

A)Economical
B)Scientific
C)Both A and B
D)Artistic

Question 22

In operations research, the are prepared for situations.

A)Mathematical models
B)Physical models diagrammatic
C)Diagrammatic models
D)Both B and C

Question 23

OR can evaluate only the effects of .

A)Personnel factors
B)Financial factors
C)Numeric and quantifiable factors
D)Both A and B

Question 24

Which technique is used in finding a solution for optimizing a given objective, such as profit maximization or cost reduction under certain constraints?

A)Qualing theory
B)Waiting Line
C)Both A and B
D)Linear Programming

Question 25

By constructing models, the problems in libraries increase and cannot be solved.

Question 26

A solution can be extracted from a model either by

A)Conducting experiments on it
B)Mathematical analysis
C)Both A and B
D)Diversified Technique

Question 27

The main limitation of operations research is that it often ignores the human element in the production process.

Question 28

Feasible solution satisfies

A)Only constraints
B)only non- negative
C)Both A and B
D)A, B and optimal solution

Question 29

What is the objective function in linear programming problems?

A)A constraint for available resource
B)An objective for research and development of a company
C)A linear function in an optimization problem
D)A set of non- negativity conditions