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प्रश्न
Define primary data and secondary data.
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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
Explain the meaning of the term Variable.
Explain the meaning of the term Class limits.
Explain the meaning of the term True class limits.
Find the mean, median and mode of the following data:
| Class | 0 – 10 | 10 – 20 | 20 – 30 | 30 – 40 | 40 – 50 | 50 – 60 | 60 – 70 |
| Frequency | 4 | 4 | 7 | 10 | 12 | 8 | 5 |
For a certain distribution, mode and median were found to be 1000 and 1250 respectively. Find mean for this distribution using an empirical relation.
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:
Explain the meaning of the following terms: Class mark
The times, in seconds, taken by 150 athletes to run a 110 m hurdle race are tabulated below:
| Class | Frequency |
| 13.8 - 14 | 3 |
| 14 - 14.2 | 4 |
| 14.2 - 14.4 | 6 |
| 14.4 - 14.6 | 69 |
| 14.6 - 14.8 | 48 |
| 14.8 - 15.0 | 20 |
The number of athletes who completed the race in less than 14.6 seconds is?
Can the experimental probability of an event be a negative number? If not, why?
Can the experimental probability of an event be greater than 1? Justify your answer.
