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1.       Using the unit normal table, find the proportion under the curve that lies above (in other words to the right) of the following z-scores. (Remember you may need to adjust your strategy for negative z scores). 

a.       z = 2.00

b.       z = -1.5

c.       z = 0

2.       Using the unit normal table, find the proportion that lies between a z = -1.5 and a z = 1.5. 

3.       The final exam in Stats has a mean of 70 and a variance of 25 

a.       What is the percentile rank for an exam score of 80? 

b.       What would you need to score to be in the top 10% of students?

4.       In a hypothetical study of smokers, the mean time to quit in those who quit with a Nicotine Replacement therapy (M = 6.2, SD = 4.2) was significantly shorter than those who tried to quit cold turkey (M = 18.6, SD = 8.4). What percentage of participants took at least 5 months to quit in the Nicotine Replacement therapy group? (HINT: At least implies 5 month or less).


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