Duncan Designed a Study to Examine Whether Sunscreen with a Higher

Multiple Choice

Duncan designed a study to examine whether sunscreen with a higher SPF was able to protect participants from sunburn better than sunscreen with a lower SPF. To test this, he randomly assigned half of his participants to wear a sunscreen with an SPF of 50. The other half were assigned to wear a sunscreen with an SPF of 35. After participants spent five hours in the sun, Duncan compared the level of sunburn across the groups. Which of the following would indicate that his two-group experimental study yielded a significant difference?

A) t(101) = 5.31, p = .09, d = .29
B) t(101) = 8.62, p = .03, d = .67
C) t(101) = 1.61, p = .15, d = .22
D) t(101) = 2.89, p = .72, d = .30