A Researcher Plans to Conduct a Complete Repeated Measures Design

Multiple Choice

A researcher plans to conduct a complete repeated measures design in which the independent variable is manipulated using four conditions that vary the level of violence depicted in a photograph (none,low,medium,high) .There are 10 photographs in each of the four conditions.Each participant will rate each photo once.If the researcher wishes to have 80 ratings for each photo,how many participants should the researcher recruit?

A) 2
B) 10
C) 40
D) 80