Sex ratios and birth order in geese. Is sex determination truly a random process

Question

Sex ratios and birth order in geese. Is sex determination truly a random process? The laws of genetics would suggest so because of the random distribution of X and Y chromosomes among sperm cells. However, physiological or environmental factors could favor one gender over the other under spoofs circumstances. A field biologist surveyed a random sample of lesser snow geese nests containing exactly four eggs. For each egg resulting in a live gosling, the laying order and the gender of the gosling were recorded. Here are the data:

Explanation / Answer

a) yes!

b) H0 : SEX RATIO AND BIRTH ORDER IN GEESE IS INDEPENDENT AG. H1 : DEPENDENT


C) EXPECTED

D)

e) df = ( 2-1) * ( 4-1) = 3..

f) The chi-square statistic is 11.9747.
The p-value is .00747.

g)The result is significant at p < .05. i.e, sex ratio and birth order in Geese is dependent of each other!there exists a relation between them!

1 2 3 4 total male 12.79 11.84 11.37 9.00 45 female 14.21 13.16 12.63 10.00 50 total 27 25 24 19 95=G

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