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In a report by Reuters, the headline read "Emotional Support Helps Breast Cancer Survival" The headline was based on a study of 847 women (442 black women and 405 white women) with breast cancer and how they fared over a 9-year period. The authors wrote "Women in our study who reported low levels of both emotional expression and emotional support experienced 2 to 4 times greater breast cancer mortality than women reporting high levels of both".
-The conservative margin of error for the sample of 847 women is
A) 0.1%.
B) 3.4%.
C) 4.0%.
D) none of the above.

Question

Quizplus · Accepted Answer

The conservative margin of error for a sample size of 847 can be calculated using the formula for the margin of error at a 95% confidence level, which is approximately 1.96 * sqrt((0.5*0.5)/n), where n is the sample size. Plugging in 847 for n gives a margin of error close to 3.4%, making option B the correct choice.

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