Statistics and Econometrics-Online Practice Exam 5

Test

Question

1.  Which of the following statements is incorrect?

Algebraic sum of deviations from arithmetic mean is equal to zero

For a symmetrical distribution, mean = mode

For dealing with qualitative data, median is most suitable

None of the above

Question

2. Which of the following statements is/are true ?

1. The mean of a series remains unaffected if an observation equal to mean is included in the series.
2. 50th percentile is median.
3. Q1 equals the 25th percentile.
4. A.M. can be calculated for a distribution with open ends.

II and III Only

I, II and III Only

I, II and IV Only

I and IV Only

Question

3. Which of the following is not true ?

Quartiles divide the series in four parts

Mean is highly affected by extreme values

Percentiles are hundred in number

Median is not affected by extreme observation

Question

4. Which of the following statements is/are correct ?

1. Measures of central tendency are called averages of first order.
2. Histogram is used to find mode graphically.
3. If the mean, median and mode of a data set are equal, then the distribution of the data is symmetrical.
4. Median is the point below which 50% of the data items fall.

All of the four

I, II and III

III and IV only

Only I and IV

Question

5. Which of the following is not correct ?

The arithmetic mean of the first N natural numbers is

If for a symmetrical distribution. Q1 and Q3 are 20 and 40 respectively, then the value of 50th percentile will be 30

First quartile divides the series into two equal parts

G.M. is used to obtain average exponential rates of growth

Question

6. Which of the following statements is/are correct ?

1. Mode is the value with maximum frequency in the data.
2. Mean is based on all the observations.
3. 75% observations in a distribution are greater than Q3.
4. 80% of observations of a series lie between first and ninth deciles.

I , II, III and IV

I and IV Only

II and IV Only

I , II and IV Only

Question

7. Mean is not used in-

Calculating per capita income of a country

Correlation and regression analysis

Quality control

Case of open ended class intervals

Question

8. If different articles are purchased at different rates by spending equal amount on each article, the average rate of purchase is given by-

Harmonic mean

Median

Geometric mean

Arithmetic mean

Question

9. In averaging index numbers, which of the following averages is used ?

G. M

A.M

H. M

Median

Question

10. In compound interest calculations average rate of interest against varying rate of interest is calculated by-

A. M

G. M

H. M

Median

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