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2.1.3 Sampling techniques

A college investigates every student's journey time. What data collection method is this?

A

stratum sizepopulation size×total sample size\frac{\text{stratum size}}{\text{population size}}\times\text{total sample size}population sizestratum size​×total sample size

B

25, since 300720×60=25\frac{300}{720}\times60=25720300​×60=25.

C

A census.

D

A representative sample reflects the population's relevant characteristics, while a sampling frame is the list from which units are selected.

2.1.3 Sampling techniques Flashcards

  1. A Level
  2. /Maths
  3. /2.1.3 Sampling techniques

Flashcards for OCR A Level Maths 2.1.3 Sampling techniques, covering the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3. 24 cards, matched to the OCR A Level Maths (H240) specification. Recall questions account for roughly 50% of marks at A Level Maths, so these target the marks you can secure before the paper starts.