Instructors Gave Caffeine to Fruit Flies to See If It

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. From these intervals:

A) there is not sufficient evidence to conclude that _control  _low.
B) there is sufficient evidence to conclude that _control  _high.
C) there is sufficient evidence to conclude that _high  _low.
D) All of the answer options are correct.