There are two types of sneetches, the star-bellied sneetch (S. astra) and the pl

Question

There are two types of sneetches, the star-bellied sneetch (S. astra) and the plain sneetch (S. simplex). Professor O. B. Servant counted sightings of these sneetches, identified each sneetch he saw, and classified their location into the three types: Ground, Tree, and Lake. The number of sightings are shown in the table below S. astraS. simplex Ground Tree Lake 60 34 28 35 41 42 Professor O.B. Servant would like to know if the habitat use is independent of the types of sneetches. Find the expected frequency for S. astra on ground if the habitat use is independent of the types. Round your answer to the nearest 0.01.

Explanation / Answer

Expected frequency for S. astra on ground

= (Row total * Column total) /Grand total

= (60 + 35)*(60 + 34 + 28) / (60 + 35 + 34 + 41 + 28 + 42)

= 48.29

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