In the unexposed group the mean systolic Use following information

Question 2 / 7:

Use the following information for questions 1-3:

In a cohort study of breast cancer in older women, there are two groups, those who were exposed to a known carcinogen and those who were not.

In the unexposed group, the mean systolic blood pressure was 105 mm Hg, with a standard deviation of 12 mm Hg. The sample size of the unexposed group was 196. What is the 95% confidence interval for the mean systolic blood pressure of this group?

Answer:

First, find the standard error:

= Standard deviation / sqrt(N)

= 12 / sqrt(196)

= 12/14 = 0.857

Then, calculate the confidence intervals:

95% CI = mean + 1.96*SE

= 105 + 1.96*0.857

= 105 + 1.68

= (103.3, 106.7)

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https://www.jobilize.com/epidemiology-sampling-confidence-intervals-quiz-by-dr-janet-forrester

Epidemiology Sampling & Confidence Intervals

Author:

Dr.Janet ForresterProfessor

Tufts University School of Medicine

USA

Access: Public Partially Instant Grading

Attribution: Janet, E.A. Forrester, Kwan Ho Kenneth Chui, Steven Cohen, Michael D. Kneeland, Alice Tang, David Tybor. Epidemiology and Biostatistics 2010. (Tufts University OpenCourseWare), http://ocw.tufts.edu/Course/65/ (Accessed 3 May, 2014). License: Creative Commons BY-NC-SA

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