DrMcMillan Is Studying the Effects of Violent Cartoon Watching on Aggressive

Multiple Choice

Dr.McMillan is studying the effects of violent cartoon watching on aggressive play behaviour in school-aged children.She divides the children up into two groups: one group watches a violent cartoon for 20 minutes and the other group watches a non-violent cartoon for 20 minutes.Then,all the children play together in a large area,and researchers count the number of aggressive acts performed by each child.Most importantly,when the researchers are counting aggressive acts,they don't know which child watched which cartoon.What potential influence on the results is Dr.McMillan mindful of in collecting her data this way?

A) sampling bias
B) demand characteristics
C) researcher bias
D) participant bias