A classmate designs the following experiment. What advice would you give him to improve upon it? Group A M T M Group B M T(zero level) M
a. to specify both groups as receiving zero level of T
b. not to perform a pretest-posttest
c. to randomly assign participants to groups
d. to randomly select participants from the population
Question 2
In a Solomon four-group design:
a. participants who get a pretest also get a posttest.
b. not all participants receive the pretest.
c. not all the participants received the posttest.
d. all participants receive a pretest but not all receive a posttest.
Hershey and Chase experiment showing that the genetic material of T2 phage is DNA
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