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The [ ] is the complete set about which information is required. Each member is a sampling unit.
A
Excluded groups cannot be selected, causing under-representation.
B
In simple random sampling, every possible sample of the required size has an equal selection chance. In systematic sampling, units are selected at regular intervals.
C
360600×50=30\frac{360}{600}\times 50=30600360×50=30 students.
D
The population is the complete set about which information is required. Each member is a sampling unit.
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2.1.1 Populations, samples and sampling techniques Flashcards
20 flashcards on AQA A Level Maths 2.1.1 Populations, samples and sampling techniques: the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.