spring08 key 3

spring08 key 3 - hypothesis or theory. • H O : No...

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ANTH 4000/5000 Spring 08 Homework Key 3 1A.) 340.7/8= 42.59 1B.) H O : No Difference (or, hamadryas = anubis in testicle size) H 1 : hamadryas and anubis baboons differ in testicle size (or, hamadryas ≠ anubis) Choose the Z-test because you have a known parameter and a sample. It’s a one sample goodness-of-fit test. Two-tailed (There is no direction to H 1 ) with alpha set at 0.01, the CV Z : ±2.58 (any lower and you have more than .5% in each tail) 1C.) 0094 . 0 , 35 . 2 8 3 . 8 5 . 49 59 . 42 = - = - = - = p N X z σ μ 2-tails = 2(0.0094) = 0.0188 Therefore, H O retained 01 . 0 p You can also write it in terms of the calculated z and the critical value of z (CV z ): 2.35 < 2.58 Therefore, H O retained 01 . 0 p 2A.) The “sperm competition hypothesis” is just a piece of theory that allows you to make a one-tailed hypothesis. It gives you a reason to suspect that hamadryas baboons have smaller testicles than anubis baboons. If hamadryas baboons have significantly smaller testicles than anubis baboons, this would support the sperm competition
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Unformatted text preview: hypothesis or theory. • H O : No Difference (or hamadryas = anubis) • H 1 : hamadryas < anubis • Z-test • One-tailed • α = 0.01 • CV Z : 2.33 0094 . , 33 . 2 35 . 2 =-= p z Therefore, H O rejected 01 . < p 3.) S= 3.83 83 . 3 71 . 14 1 8 95 . 102 1 2 = =-=-= ∑ N x S ∑ = 95 . 102 2 x 4A.) Use a Z-score to find this “individual” under the anubis distribution. 2033 . , 83 . 3 . 8 5 . 42 9 . 42 =-=-=-= p X z σ μ 20.33% of anubis baboons have smaller testicles than this individual. The probability of an anubis this different is 2(20.33)= 40.66% 4B.) The percentage of anubis with larger testicles is 100-20.33= 79.67% X x x 2 38. 5-42.6-4.1 16.8 1 40. 7-42.6-1.9 3.61 48. 9-42.6 6.3 39.6 9 47. 1-42.6 4.5 20.2 5 44. 3-42.6 1.7 2.89 39. 1-42.6-3.5 12.2 5 42. 2-42.6-0.4 0.16 39. 9-42.6-2.7 7.29...
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This note was uploaded on 02/27/2008 for the course ANTH 4000 taught by Professor Vangerven during the Spring '08 term at Colorado.

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spring08 key 3 - hypothesis or theory. • H O : No...

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