10. Test yourself

Factorial experimental designs involve one fixed and one random effect

Factorial experimental designs involve two or more fixed effects

False. Two or more fixed effects factors

True

Factorial experiments can be designed as completely randomised, randomised block or even Latin square designs

Each factor in a factorial experiment should have two or more levels

True. Strictly they are arrangements of treatments rather than “designs”

A significant interaction implies that the magnitude of response to one factor depends on the level of another factor

Group size in a factorial design can be as low as two, or even lower with special assumptions

True.

True. We average across several groups

Factorial experiments provide an efficient way of finding out what factors influence an outcome of interest.

True. They often require no more animals but provide more information