4.1 Populations, samples and data collection

4.1 Populations, samples and data collection Quiz

IB Maths: Analysis and Approaches HL: Quiz

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5 questions, one answer each

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1. Which of these is continuous data?
- A. Number of siblings
- B. Shoe size
- C. Mass of an apple
- D. Number of cars in a car park
2. A factory has 120 day-shift and 80 night-shift workers. A stratified sample of 25 is taken by shift. How many night-shift workers are chosen?
- A. 10
- B. 12
- C. 15
- D. 8
3. Data have $Q_1 = 45$ and $Q_3 = 61$ . Which value is an outlier?
- A. 20
- B. 30
- C. 80
- D. 84
4. A researcher asks every 10th shopper leaving a supermarket. Which technique is this?
- A. Simple random
- B. Systematic
- C. Stratified
- D. Quota
5. A temperature log shows $-80^\circ$ C for a July afternoon in Dubai. What should be done?
- A. Keep it: it is an outlier
- B. Treat it as an error and remove or correct it
- C. Replace it with 0
- D. Replace all values with the median