Practise the method.
Example 1
| Group | Students |
|---|---|
| Junior | 120 |
| Senior | 80 |
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Answer:
Example 2
| Group | Population | Sample support |
|---|---|---|
| A | 600 | 20% |
| B | 200 | 80% |
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Answer:
Example 3
| Group | Population | Sample size | Supporters |
|---|---|---|---|
| A | 200 | 20 | 8 |
| B | 600 | 40 | 22 |
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Answer: