Questions
Which of the following can be the coefficient of correlation 'r', between two variables?
- 2
- - 2
- 3
- 0.75
- None
Which of the following is true, if A and B are mutually exclusive?
- P(AB) = 0
- P(A/B) = P(A)
- P(B/A) = P(B)
- P(AUB) = 0
- None
If the same quantity is added to a set of data, its standard deviation
- increases
- decreases
- remains the same
- doubles
- None of these
Probability for occurrence of two events together is expressed by
- P(A/B)
- P(AB)
- P(B/A)
- P(AUB)
- None
Number of arangments that can be made using the word “both”, with or without meaning and with repetition in forming 4 lettered words is
- 256
- 128
- 64
- 258
- None
If f(x) = x + 2, find f(1/x).
- 1/(x + 2)
- (1 + 2x)/x
- 2-(1/x)
- x-2
- None
If same quantity is subtracted from all entries, arithmetic mean will
- decrease by the same quantity
- increase by same quantity
- remains the same
- doubles
- None of the above
The sum of the terms 3, 0, - 3, - 6, - 9, …. 50 is equal to
- 3926
- 3824
- 3800
- 3825
- None
The slope of a line joining the points (2,1) and (3,4) is
- 3
- 1/3
- 0
- 2
- None of the above
Point estimate is
- a single number
- an interval
- Both (1) and (2)
- Not relevant in statistics
- None of these
What is the probability that each letter is put in a different cover, if there are 3 letters and 4 covers?
- 1/64
- 1/32
- 1
- 0
- None of the above
The distance of origin from the line x + y = 9 is
- 1
- 2
- 0
- 9/rt 2
- None of these
The relation “is mother of” over a set of family members is a relation that is
- reflexive
- symmetric
- transitive
- All of the above
- None of these
A good estimator exhibits
- unbiasedness
- consistency
- efficiency
- All of these
- None of these
The chart which shows logarithm of a variable is known as
- line chart
- ratio chart
- multiple line chart
- component line chart
- None of these