The measure of dispersion which uses only two observations is called:
A. Mean
B. Median
C. Range
D. Coefficient of variation
Select an option to see the answer and solution.
In an individual series, the frequency of each observation is
A. equal
B. different
C. Both A and B
D. None of these
Select an option to see the answer and solution.
Which of the following statement(s) is/are true about a schedule?
1. If collects primary data.
2. If collects secondary data.
3. If collects qualitative data.
A. Both 1 and 2
B. Only 1
C. Both 2 and 3
D. Only 2
Select an option to see the answer and solution.
The points of intersection of the 'less than' and 'more than' ogives correspond to
A. mean
B. median
C. geometric mean
D. none of these
Select an option to see the answer and solution.
. . . . . . . . is the grouping of related facts into various classes.
A. Classification
B. Tabulation
C. Both A and B
D. None of these
Select an option to see the answer and solution.
Assertion (A) The mean of the sampling distribution of the mean is the same as the population mean.
Reason (R) As the sample size increases, samples tends to population.
A. (A) is true, but (R) is false
B. (A) is false, but (R) is true
C. Both are true
D. Both are false
Select an option to see the answer and solution.
Identify the search engine that is exclusively meant for scientific information.
A. Google
B. Yahoo
C. SCIRUS
D. Altavista
Select an option to see the answer and solution.
Sampling distribution proportion P ^ (hat) represent
A. number of successes in the sample
B. number of successes in the sample/mean
C. number of successes in the sample/n
D. None of the above
Select an option to see the answer and solution.
The sampling error is inversely proportional to the
A. Sample size
B. Population size
C. Systematic error
D. Sampling frame error
Select an option to see the answer and solution.
Four coins are tossed. The probability of getting precisely three heads is:
Select an option to see the answer and solution.
With the help of Ogive curve, we can estimate:
A. Arithmetic mean
B. Mode
C. Median
D. All of the above
Select an option to see the answer and solution.
Questionnaire survey method is used to collect
A. Tertiary data
B. Secondary data
C. Primary data
D. None of the above
Select an option to see the answer and solution.
Qualities of good questionnaire
A. Correct order
B. Proper place
C. Short and clear question
D. All of the above
Select an option to see the answer and solution.
Which of the following is not a valid characteristic of normal distribution?
A. Bell shaped
B. Asymmetrical
C. Mesokurtic
D. All are correct
Select an option to see the answer and solution.
Which of the following are true for poisson distribution?
A. The number of trials is indefinitely large
B. Probability of success is indefinitely small
C. Mean of poisson distribution is finite
D. All of the above
Select an option to see the answer and solution.
The limits of Karl Pearson's correlation coefficient value are:
Select an option to see the answer and solution.
The geometric mean of two digits-
Select an option to see the answer and solution.
According to relative frequency approach P(X) is equal to
A. n → ∞ lim n n x
B. n → ∞ lim n x n
C. n → 0 lim n n x
D. None of these
Select an option to see the answer and solution.
The mean of the marks of 50 students was 35. Later it was found that the marks of two students were wrongly read as 72 and 45 instead of 27 and 54. The correct mean will be
A. 34.72
B. 34.62
C. 34.82
D. 34.28
Select an option to see the answer and solution.
If the total salary of 15 employees is Rs. 1,00,000 per month, then 1,00,000/15 shows-
A. average salary of every employee to per month
B. average salary per month
C. average salary per employee
D. monthly salary of each employee
Select an option to see the answer and solution.