In a completed study, there is a known population with a normal distribution, = 25, and

Question:

In a completed study, there is a known population with a normal distribution, μ = 25, and σ = 12. What is the estimated effect size if a sample given an experimental procedure has a mean of
(a) 19.
(b) 22.
(c) 25.
(d) 30.
(e) 35?
For each part, also indicate whether the effect is approximately small, medium, or large.