Solve this question please

We want to use a confidence interval to decide whether the proportion of 20-year-old mothers who smoke is 0.5 at level of significance 0.01. So a = and a / 2 = We will use a % confidence interval. The null hypothesis is p = When we take a sample, we find that the sample proportion of mothers who smoke is 0.42. For this problem, Po and p - To calculate the confidence interval, we still need to know the sample size; and we will also need Z a /2