Researchers wanting to assess skin irritation associated with a new sunscreen developed for those with photosensitivity. They randomly sample 240 men with a history of photosensitivity and 240 men without a history of photosensitivity and ask them to apply the cream and report the level of skin irritation they experience after spending 20 minutes in the sun using a scale of 0-10. The average skin irritation score for the group with a history photosensitivity was 1.2 and the average skin irritation score for the group without a history of photosensitivity was 1.4. The Levene's test for equality of variances had a p value of 0.08. You know this means:
A) The researchers should report the t test results assuming equal variances.
B) The researchers should report the t test results NOT assuming equal variances.
C) The researchers should reject the null hypothesis and report there is a difference in the average skin irritation score.
D) The researchers should fail to reject the null hypothesis and conclude there is NOT a difference in the average skin irritation score.

Question

Quizplus · Accepted Answer

The p-value of 0.08 from Levene's test suggests that there is no significant difference in variances between the two groups (since it is greater than the common alpha level of 0.05), so equal variances can be assumed for the t-test.

Researchers Wanting to Assess Skin Irritation Associated with a New