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Example 157 part A

 

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

 

 

 

 

 

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