Question: A _____________________ sample is obtained by selecting convenient population units A. Random B. Quota C. Stratified D. Convenience Take the formula Z = (X -

A _____________________ sample is obtained by selecting convenient population units

A. Random

B. Quota

C. Stratified

D. Convenience

Take the formula Z = (X - )/, where is the mean of the population, X is the value of the element, Z is the z-score and is the standard deviation. What does this formula calculate?

A. Confidence interval.

B. Standard score.

C. Standard error of the mean.

D. Variance.

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