Duncan Designed a Study to Examine Whether Sunscreen with a Higher

question 56

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 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

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