Please look at question below and answer.

Thinking 17. A recent survey of 1200 people indicated that 34% of the population took a vacation outside the country in the past year. a) Calculate the margin of error for this survey for a 95% confidence level. [2 marks] b) How would the margin of error change if the sample size were 900 people? [3 marks] c) To have a margin of error of 12%, how many people would need to have been sampled? [3 marks]