Question

In the Framingham heart study, a group of 1,545 men and 1,781 women were measured on a variety of scales. One was cholesterol level, with thee men having an average level of 192.4 and a standard deviation of 35.2, and the women having an average level of 207.1 and a standard deviation of 36.7. Find a 99% confidence interval for the difference in average cholesterol level between men and women

Answer 1

Mean1 = 192.4

Sample size1 (n1) = 1545

Standard deviation1 (s1) = 35.2

Mean2 = 207.1

Sample size2 (n2) = 1781

Standard deviation2 (s2) = 36.7

Confidence interval(in %) = 99

Since we know that

Required confidence interval = (-14.7-3.2301, -14.7+3.2301)

Required confidence interval = (-17.9301, -11.4699)

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