Statistics: Confidence intervals - don't understand problems?

Update: The public opinion is split 65% against and 35% for increasing taxes to help balance the federal budget. Suppose also that 600 people from the population are selected randomly and interviewed. a. Suppose that in the sample of 600, 120 people are in favour of increasing tax. Based on this information construct a... show more The public opinion is split 65% against and 35% for increasing taxes to help balance the federal budget. Suppose also that 600 people from the population are selected randomly and interviewed.

a. Suppose that in the sample of 600, 120 people are in favour of increasing tax. Based on this information construct a 95% confidence interval for the true value of the proportion of people who are in favour of increasing taxes and remember you know its actual value is p = 35%.
Update 2: b. Was your 95% confidence interval successful in capturing the value p = 35%, which is the true value of the proportion of people who are in favour of increasing taxes? How would you explain this?

Can someone teach me how to do these?
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