When the sample statistic differs from the population parameter it estimates purely by chance, we refer to this difference as being due to:
a. population drift
b. random variation
c. sampling bias
d. unipolar differentiation
When the sample statistic differs from the population parameter it estimates purely by chance, we refer to this difference as being due to:
a. population drift
b. random variation
c. sampling bias
d. unipolar differentiation
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