Example of Chi Square for Coevolution Lab

Species	Tree obs	Tree exp ( )	Ground obs	Ground exp ( )	Total
Black-capped Chickadee	32	17.766	10	24.57	42
Tufted Titmouse	28	13.536	14	18.72	32
Dark-eyed Junco	7	15.228	29	21.06	36
Eastern Grey Squirrel	2	13.536	30	18.72	32
Total	60		83		142

Some Examples of Calculating the Expected Frequencies

Tree(exp) - Black-capped Chickadee and Tree(exp) - Tufted Titmouse

Ground(exp) - Black-capped Chickadee and Ground(exp) - Tufted Titmouse

Chi Square Calculation - beginning with Black-capped Chickadee and Tufted Titmouse