a) Find the value of t for the difference between two means based on an assumption of normality and this information about two samples. (Use sample 1 - sample 2. Give your answer correct to two decimal places.)
| Sample |
Number |
Mean |
Std. Dev. |
| 1 |
25 |
38.1 |
13 |
| 2 |
26 |
42 |
10.8 |
b). Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.)
| Sample |
n |
x |
| G |
385 |
322 |
| H |
429 |
339 |
c). Find the critical value for the hypothesis test, given the following. (Give your answer correct to two decimal places.) Alternative Hypothesis: Sigma 1 > Sigma 2, with n1 = 7, n2 = 7, and alpha = 0.01 Hint: F=?