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+Exercise: Binomial test power simulation
+================
+
+## Birth rates
+
+Kanazawa (2007) claims that beautiful parents have more daughters
+
+- Plan a study and calculate the sample size necessary to
+  - detect a deviation from the global 106:100 male-female sex ratio
+  - with about 80% power
+- Wanted: Substance-matter knowledge
+  - What would be a minimum relevant deviation (effect)?
+  - Considering the literature on birth rates, what would be a realistic
+    deviation?
+- Some background
+  - <https://en.wikipedia.org/wiki/Human_sex_ratio>
+  - Literature cited there (e.g., Davis, Gottlieb, and Stampnitzky 1998;
+    Mathews and Hamilton 2005)
+
+### References
+
+<div id="refs" class="references csl-bib-body hanging-indent">
+
+<div id="ref-DavisGottlieb98" class="csl-entry">
+
+Davis, D. L., M. B. Gottlieb, and J. R. Stampnitzky. 1998. “Reduced
+Ratio of Male to Female Births in Several Industrial Countries: A
+Sentinel Health Indicator?” *Journal of the American Medical
+Association* 279 (13): 1018–23.
+<https://doi.org/10.1001/jama.279.13.1018>.
+
+</div>
+
+<div id="ref-Kanazawa07" class="csl-entry">
+
+Kanazawa, S. 2007. “Beautiful Parents Have More Daughters: A Further
+Implication of the Generalized Trivers–Willard Hypothesis (gTWH).”
+*Journal of Theoretical Biology* 244 (1): 133–40.
+<https://doi.org/10.1016/j.jtbi.2006.07.017>.
+
+</div>
+
+<div id="ref-MathewsHamilton05" class="csl-entry">
+
+Mathews, T. J., and B. E. Hamilton. 2005. “Trend Analysis of the Sex
+Ratio at Birth in the United States.” *National Vital Statistics
+Reports* 53 (20): 1–20.
+
+</div>
+
+</div>