Question

46. Researchers wanting to assess skin irritation associated with a new sunscreen developed for those with photo sensitivity. They randomly sample 240 men with a history of photo sensitivity and 240 men without a history of photo sensitivity 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 history of photo sensitivity was 1.2 and the average skin irritation score for the group without a history of photo sensitivity was 1.4. The Levene's test for equality of variances had a p value of 0.04. You know this means: a. The researchers should report the t-test results NOT assuming equal variances b. The researchers should reject the null hypothesis and report there is a difference in the average skin irritation score c. The researchers should report the t-test results assuming equal variances d. The researchers should fail to reject the null hypothesis and conclude there is NOT a difference in the average skin irritation score

          46. Researchers wanting to assess skin irritation
associated with a new sunscreen developed for those with photo
sensitivity. They randomly sample 240 men with a history of photo
sensitivity and 240 men without a history of photo
sensitivity 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 history of photo sensitivity was 1.2 and
the average skin irritation score for the group without a history
of photo sensitivity was 1.4. The Levene's test for
equality of variances had a p value of 0.04. You know this
means:
a. The researchers should report the t-test results NOT assuming
equal variances 
b. The researchers should reject the null hypothesis and report
there is a difference in the average skin irritation
score 
c. The researchers should report the t-test results assuming
equal variances
d. The researchers should fail to reject the null hypothesis and
conclude there is NOT a difference in the average skin irritation
score

Added by Cody M.

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