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प्रश्न
Which of the two – the primary or the secondary data – is more reliable and why?
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उत्तर
The word data means information statistical data and of two types
(i) Primary data, (ii) Secondary data
Primary data are reliable and relevant because they are original in character and are collected by some individuals or by research bodies.
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संबंधित प्रश्न
Describe some fundamental characteristics of statistics.
A survey regarding the heights (in cm) of 50 girls of a class was conducted and the following data was obtained:
| Height in cm |
120 – 130 | 130 – 140 | 140 – 150 | 150 – 160 | 160 – 170 |
| No. of girls |
2 | 8 | 12 | 20 | 8 |
Find the mean, median and mode of the above data.
The table below shows the daily expenditure on food of 30 households in a locality:
| Daily expenditure (in Rs) | Number of households |
| 100 – 150 | 6 |
| 150 – 200 | 7 |
| 200 – 250 | 12 |
| 250 – 300 | 3 |
| 300 – 350 | 2 |
Find the mean and median daily expenditure on food.
Find the class marks of classes 10 -25 and 35 – 55.
The distribution X and Y with total number of observations 36 and 64, and mean 4 and 3 respectively are combined. What is the mean of the resulting distribution X + Y?
Find the class marks of classes 10−25 and 35−55.
Which of the following is not a measure of central tendency?
Explain the meaning of the following terms: Class mark
Explain the meaning of the following terms: Frequency
Can the experimental probability of an event be a negative number? If not, why?
