• Card 2 / 9: In this study, the researchers found that, on average, those on the all?-beet diet lost an average of 4.5 pounds with a standard deviation of 4.0 pounds, compared to those on the traditional diet, who lost an average of 4.6 pounds, with a standard deviation of 4.9 pounds. If the statistical test comparing weight lost between the two groups had a statistically significant result, what would you conclude about the study?
    A) The study had inadequate power.
    B) The study had an inadequate sample size.
    C) The study has a type?-I error rate <0.05.
    D) The p?-value is <0.05.
    E) The results may be clinically significant, but not statistically significant.

    Answer:
    D) The p?-value is <0.05.

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Epidemiology Hypothesis Testing & P-values

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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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