Using the above example $-$ European crossbills $($Loxia curvirostra$)$ have the tip of the upper bill either right or left of the lower bill, which helps them extract seeds from pinecones. Some have hypothesized that frequency$-$dependent selection would keep the number of right and left$-$billed birds at a $1$:$1$ ratio. Groth $(1992)$ observed $1752$ right$-$billed and $1895$ left$-$billed crossbills.

Calculate the expected values for the chi squared analysis $($show your workings$).$