Please could someone show me how to solve these with the work shown please?

e. Find the 90% confidence interval of the population proportion (1 mark/work, 1 mark/answer): A researcher wishes to be 95% confident that her estimate of the true proportion of individuals who travel overseas is within 4% of the true proportions. Find the sample necessary if, in a prior study, a sample of 200 people showed that 40 traveled overseas last year. a. What is the a/2 value for 95% b. Calculate Za/2 for a 95% (1 mark) (1/2 mark/work, 1/2 mark/answer) (2) c. What is E? (1 mark/answer in decimals) d. Calculate p (12 mark/work, 1/2 mark/answer) (2) e. Calculate q f. Calculate the sample size (1/2 mark/work, 1/2 mark/answer) (1/2 mark/work, 1/2 mark/answer - round it up)