A researcher is performing a study consisting of two conditions. She wants to have 20 observations in each condition. If she uses an independent-measures design she will need a total of _____...

A researcher is performing a study consisting of two conditions. She wants to have 20 observations in each condition.

If she uses an independent-measures design she will need a total of _____ participants. If she uses a repeatedmeasures design she will need a total of ______ participants.