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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.
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2.1.3 Sampling techniques Flashcards
24 flashcards on OCR A Level Maths 2.1.3 Sampling techniques: the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.