Study questions
- Use CS16Data1b and follow the methods used in this case study to analyse dry corm weight and number of corms at the field site Umbumbulu. Compare your results with those of Ukulinga and interpret any differences that you find.
- Discuss the advantages and disadvantages of a split-plot design compared with that of a randomised block. You can use the examples in this case study to support your arguments. Discuss the possibilities of arranging the samples in Study 2 as a randomised block
rather than a split-plot within each of the rooms.
- Carry out analyses of variance for variables Ca, Mg and K in CS16Data1a. Based on
the results for these minerals what can you say about the nutritional benefits of each of the three landraces?
This is one of the requirements set out in the Research strategy. Similarly analyse specific
gravity. High specific gravity is one of the qualities needed for crisp making. What do the results tell you?
- We have seen that yields are reduced when planting is later than November and that this affects not only
the mean yield but also the experimental error. An alternative would be to analyse data for the first two
planting dates only. Do this for dry corm yield and number of corms and compare with the analysis based on
the three planting dates. Which method would you recommend for dealing with these data?
- In reporting the results of this case study it is decided to present the
mean results for dry corm weight and number of corms in the forms of bar charts
rather than tables. Display the mean values shown in the tables under Reporting
in bar charts. Would it be better to list landrace means within planting date or vice versa?
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