Question: 17.22 Ginkgo extract and the post-lunch dip. The postlunch dip is the drop in mental alertness after a midday meal. Does an extract of the

17.22 Ginkgo extract and the post-lunch dip. The postlunch dip is the drop in mental alertness after a midday meal.

Does an extract of the leaves of the ginkgo tree reduce the post-lunch dip? Assign healthy people aged 18 to 40 to take either ginkgo extract or a placebo pill. After lunch, ask them to read seven pages of random letters and place an X over every

e. Count the number of misses per line read."

(a) What is a placebo and why was one group given a placebo?

(b) What is the double-blind method and why was it used in this experiment?

(c) Here are summaries of performance after 13 weeks of either ginkgo extract or placebo:

Group Group size Mean Std. dev.

Ginkgo Placebo 21 18 0.06383 0.05342 0.01462 0.01549 Is there a significant difference between the two groups? What do these data show about the effect of ginkgo extract?

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