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Example 157 part A
Lecture Examples
Example 157: The results of a CRD experiment for corn crop yields are given below. The multiple comparison intervals to compare the treatments A, B, C, and D were provided by SPSS. Using the SPSS output below, rank the treatments from lowest to highest, express the results in a diagram using bars to join the means that are not significantly different, and form a confidence interval for the true mean yield (in tons) for the highest of the four treatments.
Treatments |
Yields |
|||
A |
3.7 |
3.6 |
3.5 |
3.5 |
B |
1.2 |
3.4 |
3.1 |
2.5 |
C |
0.5 |
1.0 |
0.7 |
0.6 |
D |
1.3 |
3.0 |
3.3 |
2.6 |
Source |
DF |
SS |
MS |
F |
P-value |
Treatments |
3 |
17.212 |
5.737 |
12.875 |
0.0005 |
Error |
12 |
5.348 |
0.446 |
|
|
Total |
15 |
22.56 |
|
|
|