An herbal medicine brand contains amounts of the active ingredient (in milligrams, mg) that vary normally from capsule to capsule. A quality control engineer assesses whether capsules of this brand contain larger amounts, on average, than the marketed amount of 10 mg. A simple random sample of 25 capsules finds a mean content of 9.2 mg per capsule. Which of the following options are the appropriate null and alternative hypotheses?
A. Ho: µ = 10 versus HA: µ > 10
B. Ho: µ = 9.2 versus HA: µ > 9.2
C. Ho: x-bar = 9.2 versus HA: x-bar > 9.2
D. Ho: x-bar = 10 versus HA: x-bar > 10