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?

Question

Accepted Answer

A, C. M takes the values 3, 4, 5 with probability 1/3 each: E(M) = 4, E(M²) = 50/3, E(M³) = 72, Var(M) = 2/3.

SRS, stratified and systematic sampling

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