Section 12.2

#5. Since there were four different treatments, we get:

a) From the number of treatments you should be able to determine what this hypothesis should be.

b) H_{1} always takes on the same form, from problem to problem.

c) Read this off of the Statdisk display shown.

d) Read this off of the Statdisk display shown.

e) Read this off of the Statdisk display shown.

f) You should be able to draw a "reject vs fail to reject" conclusion by either looking at the p-value, or by comparing F-value to the F_{c}-value.

g) Look back on page 639 to see the data the problem is referring to.

#6. Similar to problem #5, though you are reading off of the TI-83/84 display in the margin to the right. You will have to find your own F-critical value (from the F chart).

#7. You should be able to answer the question simply by looking at the display on page 651, but make sure you support your conclusion. (That is, don't just say reject or fail to reject. Identify why you chose that conclusion.)

#8. This time you are reading off of the Minitab display.

#12. All of the important numbers have been calculated for you. You just need to fill in the chart, and then do the hypothesis test. Construct the chart (as below), then determine what to fill into positions a, b, c, ... j.

Source | SS | DF | MS | F |
---|---|---|---|---|

Treatment | 128.95 |
b |
e |
h |

Error | a |
d |
f |
i |

Total | 641.00 |
c |
g |
j |

Here's a start: Position a: Since the first two SS numbers must add up to the third one, this cell must get 641.00 - 128.95 = 512.05.

Position b: The degrees of freedom for the treatments is the number of treatments minus 1, so 4-1 = 3.