A random sample is selected from a normally distributed population with a mean of = 100 and a standard deviation of = 24. After a treatment is administered to the participants in the sample, the following sample means are calculated. For each of the following samples, test whether the sample mean is sufficient to conclude that the treatment had an effect for that sample size. Use a two-tailed test with = .05. Be sure to follow all steps in hypothesis testing: 1. state the null and alternative hypotheses symbolically, 2. identify the criterion for rejecting the null hypothesis, 3. calculate the test statistic z, and 4. make a decision about whether to reject the null hypothesis. You should not need to repeat steps one and two. For each test, compute Cohen"s d.

a. M = 91 for n = 4 scores

b. M = 91 for n = 9 scores

c. M = 91 for n = 25 scores

d. M = 91 for n = 36 scores

e. M = 104 for n = 4 scores

f. M = 104 for n = 9 scores

g. M = 104 for n = 25 scores

h. M = 104 for n = 36 scores

i. M = 113 for n = 4 scores

j. M = 113 for n = 9 scores

k. M = 113 for n = 25 scores

l. M = 113 for n = 36 scores