7. Test your self

Controlling variability

1. In the first example, a power analysis was used to show how much sample size could be reduced by housing mice two instead of one per cage (which required 30 mice/gropup). How much was sample size reduced?

From 30 to 18
From 30 to 25
From 30 to 14
From 30 to 12

Correct, 14 mice/group


2. In the second example when sample size was fixed at 20/group the power when using inbred strains ranged from 86->99%. However, when using outbreds the power was reduced to:

40-60%
60-80%
20-40%%
<20%

Correct, less than 20%


3. In the third example showing the effects of genotype and disease, which class of stock was phenotypically the most uniform

F1 hybrids
F2 hybrids
Outbred stocks Mycoplasma infected
stocks

Correct, F1 hybrids

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