SRS, stratified and systematic sampling
Why this is asked: Know when SRSWOR beats SRSWR (the finite population correction), and that proportional allocation beats SRS while Neyman allocation beats proportional.
Sampling designs
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The trap here
“Systematic sampling is always at least as efficient as SRS” — false
A population with a periodic pattern of period k, sampled every k-th unit
Every sampled unit falls at the same phase, so the sample can be maximally unrepresentative.
Check yourself — select all that apply
Consider a population of 3 units having values 2, 4 and 6. A simple random sample (without replacement) of 2 units is drawn. Let M be the sample mean. Which of the following statements are true?
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Open this in the full syllabus view · Unit 4