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Non-sampling errors can be minimized by taking large samples.
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In a village of 200 farms, a study was conducted to find the cropping pattern. Out of the 50 farms surveyed, 50% grew only wheat. What is the population and the sample size?
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Give two examples each of sample, population and variable.
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Which of the following methods give better results and why?
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Which of the following errors is more serious and why?
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Suppose there are 10 students in your class. You want to select three out of them. How many samples are possible?
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Discuss how you would use the lottery method to select 3 students out of 10 in your class?
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Does the lottery method always give you a random sample? Explain.
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Explain the procedure of selecting a random sample of 3 students out of 10 in your class, by using random number tables.
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Do samples provide better results than surveys? Give reasons for your answer.
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Use the data in the Table below that relate to monthly household expenditure (in Rs) on the food of 50 households and
| 1904 | 1559 | 3473 | 1735 | 2760 |
| 2041 | 1612 | 1753 | 1855 | 4439 |
| 5090 | 1085 | 1823 | 2346 | 1523 |
| 1211 | 1360 | 1110 | 2152 | 1183 |
| 1218 | 1315 | 1105 | 2628 | 2712 |
| 4248 | 1812 | 1264 | 1183 | 1171 |
| 1007 | 1180 | 1953 | 1137 | 2048 |
| 2025 | 1583 | 1324 | 2621 | 3676 |
| 1397 | 1832 | 1962 | 2177 | 2575 |
| 1293 | 1365 | 1146 | 3222 | 1396 |
Monthly Household Expenditure (in Rupees) on Food of 50 Households
Find the number of households whose monthly expenditure on food is
(b) more than Rs 3000
(c) between Rs 1500 and Rs 2500
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What do you think about the following question? Do you find any problem with this question? Describe.
How far do you live from the closest market?
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What do you think about the following question? Do you find any problem with this question? Describe.
If plastic bags are only 5 percent of our garbage, should they be banned?
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What do you think about the following question? Do you find any problem with this question? Describe.
Wouldn’t you be opposed to an increase in the price of petrol?
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What do you think about the following questions? Do you find any problem with these questions? Describe.
- Do you agree with the use of chemical fertilizers?
- Do you use fertilizers in your fields?
- What is the yield per hectare in your field?
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You want to do research on the popularity of Vegetable Atta Noodles among children. Design a suitable questionnaire for collecting this information.
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An average alone is not enough to compare series.
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The following series relates to the daily income of workers employed in a firm. Compute minimum income earned by the top 25% of workers.
| Daily Income (in Rs) | 10-14 | 15-19 | 20-24 | 25–29 | 30-34 | 35-39 |
| Number of workers | 5 | 10 | 15 | 20 | 10 | 2 |
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The following series relates to the daily income of workers employed in a firm. Compute maximum income earned by the lowest 25% of workers.
| Daily Income (in Rs) | 10-14 | 15-19 | 20-24 | 25–29 | 30-34 | 35-39 |
| Number of workers | 5 | 10 | 15 | 20 | 10 | 2 |
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How is Total Revenue under perfect competition different from Total Revenue under imperfect competition? Give two points to show the difference.
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