(Answered) A teacher wants to examine the impact of caffeine on test

Statistics

A teacher wants to examine the impact of caffeine on test performance. She randomly assigns 60 students in her class to three groups (no caffeine-placebo, 100mg of caffeine, 200mg of caffeine) and then 40 minutes later students takes a test. Which would be her independent variable

a. caffeine level

b. no caffeine vs test performance

c. test performance

d. the 40 minute time period

e. 60 students

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