​In Practice, the Most Frequently Encountered Hypothesis Test About a Population

Multiple Choice

​In practice, the most frequently encountered hypothesis test about a population variance is a

A) ​one-tailed test, with rejection region in the lower tail.
B) ​one-tailed test, with rejection region in the upper tail.
C) ​two-tailed test, with equal-size rejection regions.
D) ​two-tailed test, with unequal-size rejection regions.