(Answered) Dr hernandez wants to examine the impact of caffeine on

Statistics

Dr. Hernandez wants to examine the impact of caffeine on test performance. She randomly assigns the 60 students in her class to three groups (no caffeine-placebo, 100mg of caffeine, 200mg of caffeine) and then 40 minutes later students take a test. What kind of study is this?

a. A quasi-experimental study

b. A correlational study

c. An experimental study

d. A regression-based study

e. A lab based observational cross sectional study

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