Chi square test, what is null and proposed hypothesis

Question

According to genetic theory the number of colour strains, red, yellow, blue and white in flower A should appear in proportions 4:9:8:4. Observed frequencies of red, yellow, blue and white strains amongst 800 plants were 140, 300, 250 and 110 respectively. Are these differences from the expected frequencies significant at the 5% level?

 

What is the null hypothesis for this question?

 

what is the proposed hypothesis for this question? 

Answer 1

I can certainly do this chi square problem, but I would need to see the chi square table to compare the final value to the threshold of 0.05. The null hypothesis would be that the values for the 800 plants do not fit the criteria for the expected ratios given and therefore are due to chance while the proposed hypothesis would mean that the chi square value is equal to or lower than 0.05 and is does fit the expected ratios. Remember when looking at the table that the degrees of freedom will be 4-1 = 3 since there are four variations of flower.