The post‑lunch 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 1818 to 4040 years to take either ginkgo extract or a placebo pill. After lunch, ask them to read seven pages of random letters and place an ?� over every e. Count the number of misses per line read. Table shows like this

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The post‑lunch 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 1818 to 4040 years to take either ginkgo extract or a placebo pill. After lunch, ask them to read seven pages of random letters and place an ?� over every e. Count the number of misses per line read.

Table shows like this 

Group Gingo---- Group Size 21----------Mean 0.06383----------Standard deviation------- 0.01462

Group Placebo---- Group 18--------------- Mean 0.0532---------- Standard deviation------- 0.01549

 

1. Is there significant difference between the two groups? 

A. There is a significant difference between the two groups.

b. There is not enough information to determine this.

c. There is no difference between the groups.

d. There is a difference between the two groups, but it is not significant.

 

2.What do these data show about the effect of ginkgo extract?

A. Those who took ginkgo extract had significantly more misses per line.

b. Those who took the placebo had significantly more misses per line.

c. Those who took the placebo also took ginkgo out of curiosity.

d. Those who took ginkgo extract gave misleading information.

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