In an experiment on chlorophyll inheritance in maize (corn), of the 1103 seedlings of self fertilized green

Question:

In an experiment on chlorophyll inheritance in maize (corn), of the 1103 seedlings of self fertilized green plants, 854 seedlings were green and 249 were yellow. Theory predicts the ratio of green to yellow is 3 to 1. Show all five steps of a test of the hypothesis that 3 to 1 is the true ratio. Interpret the P-value in context.