A pharmaceutical company produces caffeine pills that are each supposed to contain 200 mg200\,\text{mg}200mg200, start text, m, g, end text of caffeine. A quality control expert took a random sample of pills from a batch and measured the amount of caffeine in each pill in the sample. They want to test if the mean amount is significantly different than 200 mg200\text{ mg}200 mg200, start text, space, m, g, end text.
H0​:μ=200 mg
Ha​:μ​ not equal 200 mg​