Snake Skin Lab

Snake Skin Lab - 3 7 19 O-E 4.2-2.8-3.8-0.8 3.2 (O-E) 17.64...

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Carly Lyons 003-630-708 Squirrel and Snake Skin Data Analysis Hypothesis: Squirrels rub snake skin mainly on the lower half of their bodies to ward off predators. Null Hypothesis: Squirrels rub snake skin on their bodies in a completely random manner to ward off predators. Methods: In this lab demonstration, videos of squirrels rubbing snake skin on themselves were observed. There were two species of squirrels being observed, and four videos for each species were watched. Every time a squirrel would rub a piece of snake skin on their flank, head, front leg, hind leg, or tail, a tally was marked down in a data table. Χ² Table for Spermophilus beechyi Flank Head Front Leg Hind Leg Tail Total Expected 3.8 3.8 3.8 3.8 3.8 19 Observed 8 1
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Unformatted text preview: 3 7 19 O-E 4.2-2.8-3.8-0.8 3.2 (O-E) 17.64 7.84 14.44 0.64 10.24 (O-E) /E 4.64 2.06 3.8 0.17 2.69 Table for Spermophilus variegates Flank Head Front Leg Hind Leg Tail Total Expected 6.2 6.2 6.2 6.2 6.2 31 Observed 7 9 15 31 O-E 0.8-6.2-6.2 2.8 8.8 (O-E) 0.64 38.44 38.44 7.84 77.44 (O-E)/E 0.10 6.2 6.2 1.26 12.49 Results: S. beechyi S. variegates Critical value 9.488 9.488 Df 4 4 value 13.36 26.25 Conclusion: Because the X value for both species of squirrels exceeds the critical value at a .05 significance level with four degrees of freedom, there is enough evidence to reject the null hypothesis. Thus, squirrels do not rub snake skin on their bodies completely randomly....
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This note was uploaded on 04/15/2008 for the course LS 1 taught by Professor Thomas during the Winter '05 term at UCLA.

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