For a particular known population, the mean is 100 and the variance is 25. A researcher conducts a study in which 10 participants are exposed to an experimental procedure. To test the hypothesis that the population these 10 participants represent is different from the known population, the comparison distribution's mean and variance would be:

Choose one answer.

a. mean=10, variance=2.5

b. mean=10, variance=5

c. mean=100, variance=2.5

d. mean=100, variance=5