spring08 homework3

# spring08 homework3 - groups and smallest in those species...

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ANTH 4000/5000 Spring 08 Homework 3 The known mean testicular volume for anubis baboons ( Papio anubis ) is 49.5cc ± 8.3. The following data on the testicular volume of hamadryas baboons ( Papio hamadryas ) was measured in the field. Papio hamadryas testicular volume (cc) 38.5 40.7 48.9 47.1 44.3 39.1 42.2 39.9 1.) A researcher wants to know if hamadryas baboons differ from anubis baboons in testicle size and she wants to be at least 99% certain (alpha is set at 0.01). A.) What is the mean of the sample? B.) State the null hypothesis, state the research hypothesis, choose a statistical test, determine whether the test is one tailed or two tailed, and determine the critical value. C.) Perform the statistic and make a decision, accept or reject H o . 2.) The “sperm competition” hypothesis holds that relative testes size is generally larger in males of species where the females mate with multiple males (multi-male multi-female
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Unformatted text preview: groups) and smallest in those species that typically exhibit pair-bonded or polygynous mating systems (one male multi-female groups). Anubis baboons ( Papio anubis ) live in multi-male multi-female social groups, while hamadryas baboons ( Papio hamadryas ) live in one-male multi-female groups. A primatologist is interested in seeing if the sperm competition hypothesis holds between the two groups. She wants to be at least 99% certain. Test the sperm competition hypothesis. (Show your work.) 3.) Calculate the standard deviation of the hamadryas baboon sample. 4.) Now consider the hamadryas sample mean as a single individual. A.)What is the probability of choosing an anubis baboon at random that is this different from the anubis mean? B.) What percentage of anubis baboons have larger testicles than this individual?...
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