Should you have a cup of coffee to make you more alert when studying for a big t

Question

Should you have a cup of coffee to make you more alert when studying for a big test? A study on the effect of caffeine involved asking volunteers to take a memory test 20 minutes after drinking cola. Some volunteers were randomly assigned to drink caffeine-free cola, some to drink regular cola (with caffeine), and others a mixture of the two (getting a half dose of caffeine). For each volunteer, a test score (the number of items recalled correctly) was recorded. The volunteers were not told which type of cola they had been given, but the researchers for the study prepared the cups of cola right on the spot (out of sight of the volunteers). a. What type of study is this? b. What is the response variable in this study?- c. What is the explanatory variable in this study? d. Which of the basic principles of statistical design were used in this study?.

Explanation / Answer

Ans:

A: Experiment

B: Test Score

C: Amount of caffeine

D: Control, Randomization Repetition and Blinding

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