In a survey of 1,000 people, 520 are opposed to the tax increase. Construct a 95% confidence interval for the proportion of those people opposed to the tax increase.
Use a proportional confidence interval formula:
CI95 = p + or - (1.96)(√pq/n)
Note: + or - 1.96 represents 95% confidence interval.
For p in your problem: 520/1000 = .52
For q: 1 - p = 1 - .52 = .48
n = 1000
I let you take it from here to calculate the interval.