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 a SPF of 50. The other half were assigned to wear a sunscreen with a SFP of 35. After five hours in the sun, he 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

Question

Quizplus · Accepted Answer

The t-value of 8.62 indicates a significant difference between the two groups, as does the low p-value of .03. Additionally, the effect size (d) of .67 indicates a medium to large effect, supporting the practical significance of the findings. Choices A, C, and D do not show significant differences between the groups.

Duncan Designed a Study to Examine Whether Sunscreen with a Higher