Hello I need help with these questions.

1) Find the estimated standard error for the sample mean for each of the following samples.

A) n = 9 with SS = 1152

B) n = 16 with SS = 540

C) n = 25 with SS = 600

2) Find the t values that form the boundaries of the critical region for a two-tailed test with = .05 for each of the following sample sizes:

A) n= 4

B) n = 15

C) n = 24

3) Find the t value that forms the boundary of the critical region in the right-hand tail for a one-tailed test with = .01 for each of the following sample sizes.

A) n= 10

B) n = 20

C) n = 30

4) A random sample of n=25 individuals is selected from a population with = 20 , and a treatment is administered to each individual in the sample. After treatment, the sample mean is found to be M = 22.2 with SS = 384 .

A) How much difference is there between the mean for the treated sample and the mean for the original population? (Note: In a hypothesis test, this value forms the numerator of the t statistic.)

B) If there is no treatment effect, how much difference is expected between the sample mean and its population mean? That is, find the standard error for M. (Note: In a hypothesis test, this value is the denominator of the t statistic.)

C) Based on the sample data, does the treatment have a significant effect? Use a two-tailed test with = .05 .