Which of the following statement is INCORRECT about the reason for running a two-samplest-test instead of running a one-samplet-test?

a.The control group may provide a baseline with which to compare the means of the experimental group

b.We need to recruit a greater number of participants in order to increase the power of the study

c.The two-samplest-test is methodologically more sound and valid than the one-sample counterpart

d.In most real research projects, we do not have information about the parameters