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April 20, 2014

Homework Help: Stats

Posted by Jackie on Thursday, November 3, 2011 at 6:21pm.

I'm having some trouble with a stats portion of an animal behavior lab. We have to do chi-sqaure tests to test 3 hypothesis, which are 1) percent prey captured will decline as prey group size increases 2) percent successful hunts will decline as prey group size increases 3) orange balls will constitute significantly more than 25% of the prey captured.

The data has four columns (singles, doubles, triples, quads are the headings). The # of prey expected to be caught for each is 12 (total=48). The # of prey caught is 12, 11, 10, 7, (total=40).
Number of hunts expected to be successful are 12, 6, 4, 3. Number of successful hunts is 12, 6, 4, 2. Number of orange balls expected to be caught is 3 for each column. The actual is 2, 2, 1, 1.

So, I assume I don't have to calculate any expected values. But do I plug directly in such as for hypothesis 1:
((7-12)^2)/12 ???

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