9.Test yourself

1. A completely randomised design is tolerant of unequal numbers in each treatment group

2. Completely randomised designs may be biased if the research environment changes over time or space

True
False
True
False

True. Unequal numbers are no problem

True because treatments may not be equally distributed


3.A randomised block design ensures that the environment is the same for each experimental unit

4. When the experimental units are heterogeneous in age or weight they can often still be used in a randomised block design

True
False
True
False

False. A RB design matches experimental units to minimise uncontrolled variability

True. This is one of the main advantages of the RB design


5. Randomising a Latin square design destroys its structure of one of each treatment in each row and column

True
False

False. Whole rows and whole columns need to be randomised to retain structure

6. A “within subject” design is just a variant of a randomised block design

True
False

True. R.block designs have several names but they are mathematically identical

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