Let’s presume that a researcher attempted to uncover a treatment effect of “brain food” on students’ memory span

Let’s presume that a researcher attempted to uncover a treatment effect of “brain food” on students’ memory span. Pretend that we know the concocted meal has a true effect (d = 0.20).

a. If memory span averages 7 (SD = 2), what can you conclude about the food-boosted memory span?

b. If a researcher tested this effect with 40 students in the “brain food” group and 40 students in the control group, what type of conclusion would this researcher invariably make?

c. What conclusion would most likely be made if d = 0.50 and 75 students were in each group?