Instructors Gave Caffeine to Fruit Flies to See If It

question 9

Multiple Choice

Instructors gave caffeine to fruit flies to see if it affected their rest. The three treatments were a control, a low caffeine dose of 1 mg/ml of blood, and a higher caffeine dose of 5 mg/ml of blood. Fifteen fruit flies were assigned at random to three treatments, five to each treatment. The minutes of rest measured over a 12-hour period were recorded; the data follow. Minitab was used to obtain 95% simultaneous confidence intervals for the differences in means among the three treatments using Tukey's procedure; the results follow. The average minutes of rest for the five fruit flies assigned to the low-dose group was:

• A)11 minutes higher than the average for the five fruit flies assigned to the control dose.
• B)89.6 minutes lower than the average for the five fruit flies assigned to the high dose.
• C)89.6 minutes higher than the average for the five fruit flies assigned to the high dose.
• D)56.21 minutes higher than the average for the five fruit flies assigned to the control dose.

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