Should You Have a Cup of Coffee to Make You

question 47

Short Answer

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 were assigned regular cola (with caffeine),and others were assigned 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).The memory test had a total of 25 items on it.The average number of items recalled was 15 for the caffeine-free group,17 for the mixture group,and 16 for the regular cola group.Are the values 15,16,and 17 statistics or parameters?

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Definitions:

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