A study to see if there is a difference in the ability of grey and white rats in learning to run a maze.

• Independent measures

• Repeated measures

• Matched pairs

A study to investigate whether a twin born first is more confident than a second born twin.

• Repeated measures

• Independent measures

• Matched pairs

A study to see if watching violent television programmes is likely to make children aggressive.

• Independent measures

• Repeated measures

• Matched pairs

An investigation to see whether people prefer gin and tonic or vodka and lime.

• Repeated measures

• Independent measures

• Matched pairs

Research into finding a cure for fear of spiders, comparing a treatment group with a non-treatment group.

• Repeated measures

• Independent measures

• Matched pairs