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Friday, July 13, 2012

Quantitative Aptitude Techniques (QT) for Exams Quiz - 3

1. Which of the following is false?
[A]A frequency distribution shows the number of observations from the data set that fall into each of the classes
[B]In a data array the data items are arranged either in the ascending or descending order
[C]Unprocessed data items are called raw data
[D]None of the above


2. The middle value of a series arranged either in ascending or descending order is called ________.
[A]Arithmetic Mean
[B]Geometric Mean
[C]Range
[D]Median


3. For a set of ‘n’ numbers one of the averages is ‘A’. If ‘nA’ is equal to the sum of all the ‘n’ numbers, then A is a
[A]Quartile
[B]Geometric Mean
[C]Arithmetic Mean
[D]Median


4. Which of the following measures of central tendency is based on the most frequently occurring value in a set of observations?
[A]Arithmetic mean
[B]Mode
[C]Geometric mean
[D]Median


5. If every item in the data set is increased by the same quantity then the standard deviation of the data set
[A]Remains the same
[B]Increases by the same quantity by which every data item is increased
[C]Decreases by the same quantity by which every data item is increased
[D]Increases by the square root of the same quantity by which every data item is increased


6. The graphical method of linear programming is suitable when the number of variables is
[A]1
[B]2
[C]3
[D]4


7. An investment in a portfolio earns different rates of return in different years. The best measure to calculate the average rate of return on the investment is
[A]Arithmetic mean
[B]Variance
[C]Geometric mean
[D]Median


8. Two events are said to be mutually exclusive if
[A]The sum of their probabilities is less than 1.00
[B]The sum of their probabilities is greater than 1.00
[C]They contain every possible outcome of an experiment
[D]They cannot occur at the same time


9. If the probability of occurrence of one event is not affected by the occurrence of another event and vice versa then the two events are said to be
[A]Collectively exhaustive
[B]Independent
[C]Dependent
[D]Mutually exclusive


10. Which of the following is true with regard to a linear equation Y – a – bX = 0, where X is the independent variable and Y is the dependent variable?
[A]The slope of the straight line is ‘a’
[B]The Y-intercept of the straight line is 0
[C]The Y-intercept of the straight line is ‘b’
[D]The slope and the Y-intercept remain constant for all combinations of X and Y values which satisfy the equation


11. Baye’s theorem helps the statistician to calculate
[A]Subjective probability
[B]Classical probability
[C]Posterior probability
[D]Central tendency


12. Which of the following is true?
[A]A linear programming problem can not have more than one solution
[B]A linear programming problem can not have a linear objective function
[C]There can be only one solution of a linear programming problem which is not within the feasible region
[D]The optimal solution to a linear programming problem occurs at one of the corner points


13. A linear programming problem can not be solved by the simplex method if
[A]The number of basic variables are lesser than the number of constraints
[B]The number of constraints are lesser than the number of basic variables
[C]Some of the right hand side values of the inequalities are negative
[D]All of the above


14. If the sum of the deviations (taking signs into account) of the items from a measure of central tendency is zero, then that measure is known as
[A]Variance
[B]Geometric mean
[C]Arithmetic mean
[D]Median


15. Which of the following is false with regard to standard error of mean?
[A]It is less than the standard deviation of the population
[B]It decreases as the sample size increases
[C]It measures the variability of the mean from sample to sample
[D]It is the standard deviation of the sample


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