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प्रश्न
Define primary data and secondary data.
उत्तर
Primary data is that which is collected by investigator himself through personal observations with a definite plan or design in mind.
Secondary data is that which has been collected previously by someone other
Than the investigator but is used by the investigator for some specific purpose.
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संबंधित प्रश्न
What do you understand by the word “statistics” in
(i) Singular form
(ii) Plural form?
Which of the two – the primary or the secondary data – is more reliable and why?
Explain the meaning of the term True class limits.
Find the mean, median and mode of the following data:
| Class | 0 – 50 | 50 – 100 | 100 – 150 | 150 – 200 | 200 – 250 | 250 – 300 | 300 - 350 |
| Frequency | 2 | 3 | 5 | 6 | 5 | 3 | 1 |
In a class test, 50 students obtained marks as follows:
| Marks obtained | 0 – 20 | 20 – 40 | 40 – 60 | 60 – 80 | 80 – 100 |
| Number of Students | 4 | 6 | 25 | 10 | 5 |
In a class test, 50 students obtained marks as follows:
While calculating the mean of a given data by the assumed-mean method, the following
values were obtained.
`A=25, sum f_i d_i=110, sum f_i= 50`
Find the mean.
The observation 29, 32, 48, 50, x, x+2, 72, 78, 84, 95 are arranged in ascending order. What is the value of x if the median of the data is 63?
Which of the following is not a measure of central tendency?
Explain the meaning of the following terms: Class mark
The Empirical relation between the three measures of central tendency is ______.
