Which of the following is a TRUE statement by Dr. Janet Forrester

Question 6 / 7: Which of the following is a TRUE statement?

A Confidence intervals are always symmetric.

B Confidence intervals for an odds ratio require that the distribution is normal or Gaussian.

C For large samples, the distribution of sample means will be approximately normal, regardless
of the distribution of the population characteristic.

D If group A has a mean of 40, a sample size of 50, and a standard deviation of 10, and if group
B has a mean of 40, a sample size of 40, and a standard deviation of 11, then the standard
error of Mean A will be larger than the standard error of Mean B.

E If group A has a mean of 40, a sample size of 50, and a standard deviation of 10, and if group
B has a mean of 42, a sample size of 50, and a standard deviation of 10, then the standard
error of Mean A will be larger than the standard error of Mean B.

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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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