An experiment was conducted in which two types of acorn squash were crossed. According to a genetic model, 1/2 of the resulting plants should have dark stems and dark fruit, 1/4 should have light stems and light fruit, and 1/4 should have light stems and plain fruit. The actual data were 220, 129, and 105 for these three categories.49 Do these data refute this model? Consider a chi-square test.
(a) What is the value of the chi-square test statistic for investigating whether these data are consistent with the 1/2,1/4,1/4 probabilities model?
(b) The P-value for the chi-square test is 0.23. If α = 0.10, what is your conclusion regarding H0?