Study questions
- Carry out a split-split-plot analysis of variance on the data for specific gravity
contained in CS16Data2. Compare the structure of the analysis of variance
with that shown under Study design to ensure that you have filled in the GenStat dialog box correctly. Examine each of the strata residual mean squares. What does this tell you about the variation within the rooms?
- Study 2 uses only one cold room and store room. What is the disadvantage of this? Replicating the
experiment in time might go some way to accounting for possible environmental room to room variations. Prepare a
suitable plan for doing so.
- Study 2 required a lot of work. Suppose it had been possible to analyse the results of Study 1 at
Ukulinga and Umbumbulu (see questions 1 and 2) before embarking on Study 2. What differences would you make
to the design of Study 2 having concluded that Dumbe-Dumbe was the recommended landrace?
- Rewrite the section describing the design for Study 2 under Study design based on your proposal in question 8
for redesigning the experiment
- Prepare an outline of the analysis of variance that you might use to analyse data contained in files CS16Data1c and CS16Data1d. Month can be considered as a repeated measure, so reference to Case Study 15 may help.
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