Test: AP Statistics

1.

Which of the following experiments has the least amount of bias? 

A survey of the number of people that watch online TV conducted using email. 

None of these examples contain any potential bias. 

A randomized double-blind experiment in which test subjects are assigned to either a placebo or a therapeutic agent that is used to improve metabolism. 

A randomized double-blind experiment in which there are two experimental groups: Group A receiving a small dose of a particular drug and Group B receiving a large dose of a particular drug. 

A survey of how many people enjoy shopping conducted at a shopping mall. 

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