Practice quiz: Variables and bias

4 questions. Pick an answer to see if it is right. You can try as many times as you like. These are for practice: the final test has different questions.

1. 1.In an experiment comparing learning rates, the accuracy you measure is the...

   independent variabledependent variableconfoundercontrol
2. 2.Coffee drinkers had more lung cancer because many also smoked. Smoking was a...

   placeboconfoundercontroldependent variable
3. 3.What did Clever Hans actually respond to?

   ArithmeticUnconscious cues from the questionerThe time of dayRandom chance
4. 4.A scale always reads 2 kg too high. It is...

   valid and reliablereliable but not validvalid but not reliableneither