Test: ACT Science

A new drug is in its clinical trial phase. The graph below shows the data for participants sleep patterns before medication use and then after using the medication for three months. Series 1 shows the average hours slept a night for each participant prior to medication. Series 2 shows the average hours slept a night for each participant after three months of use. The average hours slept a night was obtained by recording sleep every night for one month, and then finding the average. Patients one through five took a placebo pill, not the actual Moonlight medication. Note: The y-axis is measured in hours slept a night, while the x-axis lists each anonymous patient numerically.

 
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10.

This experimental design is weakened by the fact that it does not take into account __________.

the family dynamics of the participants

all of the answer choices given

external changes that could affect sleep over the couple months observed

the exercise habits and stress level of the participants

the eating habits of the participants

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