Sampling Quiz
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5 questions, one answer each
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1. A council surveys 300 of its 25 000 households. What is the population?
- A. The 300 households surveyed
- B. The answers given by the households
- C. All 25 000 households
- D. The households that reply
2. Which is a disadvantage of simple random sampling?
- A. It needs a complete list of the population
- B. Some members have no chance of being chosen
- C. It is always biased
- D. It cannot be used with large populations at all
3. What is the main weakness of opportunity sampling?
- A. It is expensive
- B. It needs a numbered list
- C. It always uses small samples
- D. It is often biased because not everyone can be chosen
4. Students are numbered 1 to 60. Random numbers are 34, 71, 08, 34, 59. Repeats and numbers above 60 are rejected. Which students are chosen?
- A. 34, 71, 08, 59
- B. 34, 08, 59
- C. 34, 34, 08, 59
- D. 08, 34, 59, 71
5. Two simple random samples of the same size from one population give different means. What does this show?
- A. Sampling variation: samples differ, so each mean is only an estimate
- B. One of the samples must be biased
- C. The population mean is unknown
- D. The samples were not random