Answer)
Null hypothesis Ho : p = 0.25
alternate hypothesis Ha : p not equal to 0.25
N = 444 + 161 = 605
First we need to check the conditions of normality that is if n*p and n*(1-p) both are greater than 5 or not
N*p = 151.25
N*(1-p) = 453.75
Both the conditions are met so we can use standard normal z table to estimate the P-Value
Test statistics z = (oberved p - claimed p)/standard error
Standard error = √{claimed p*(1-claimed p)/√n
Observed P = 161/605
Claimed P = 0.25
N = 605
Test statistics z = 0.92
From z table, P(z>0.92) = 0.1788
But our test is two tailed
So, p-value is = 2*.1788 = 0.3576
As the obtained p-value is greater than 0.05 (significance level)
We fail to reject the null hypothesis Ho
Option B
There is sufficient evidence to support the claim that 25% offsprings are yellow
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