Q2 of 174 Page 546

Define some fundamental characteristics of statistics.

Fundamental characteristics of statistics are:-

i) Data given or collected for a definite purpose can’t be used for another purpose.

ii) Numerical facts always constitute a specific data.

iii) A single observation does not form data. Data should be aggregate of facts.

iv) Qualitative characteristics cannot be measured numerically. Hence, they do not form Data.

Define statistics as a subject.

What are primary data and secondary data? Which of the two is more reliable and why?

Explain the meaning of each of the following terms:

(i) Variate

(ii) Class interval

(iii) Class size

(iv) Class mark

(v) Class limit

(vi) True class limits

(vii) Frequency of a class

(viii) Cumulative frequency of a class

Following data gives the number of children in 40 families:

1, 2, 6, 5, 1, 5, 1, 3, 2, 6, 2, 3, 4, 2, 0, 4, 4, 3, 2, 2, 0, 0, 1, 2, 2, 4, 3, 2, 1, 0, 5, 1, 2, 4, 3, 4, 1, 6, 2, 2.

Represent it in the form of a frequency distribution, taking classes 0-2, 1-4, etc.