A study was undertaken to determine if the amount of daily caffeine had an influ
ID: 3359468 • Letter: A
Question
A study was undertaken to determine if the amount of daily caffeine had an influenced on the probability of a miscarriage in pregnant women. The amount of caffeine ingested in a day was broken down into none, some but < 200 mg, and > 200 mg. We will focus on the number and proportion for women who consumed more than 200 mg of caffeine a day. The data are shown below.
If the proportion of women who consumed more than 200 mg of caffeine a day who had a miscarriage is .25 (41/164), what is the z-value to use for a 90% Confidence Interval for this estimated proportion.
Miscarriage Caffeine Yes No Row Total None 32 232 264 < 200 mg 99 536 635 > 200 mg 41 123 164 Column Total 172 891 1063Explanation / Answer
The correct answer is (Option D)
Explanation:
z value for a 90% confidence interval for a proportion = 1.645
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