In: Statistics and Probability
9) An advertising executive wished to compare two commercials to see which one people liked better. He planned to show each commercial to a separate group of 15 people and compute the mean rating for each one, to see if there was a difference. With α=0.05, what should his rejection region be?
1.t>1.7011
2.t>2.0484
3.t<-1.7011 or t>1.7011
4.t<-2.0484 or t>2.0484