COULD YOU HELP ME CHOOSE THE FORMULA NEEDED AND SHOW THE WORKS TO HELP CLEAR UP ANY OF MY CONFUSION. THANKS A survey of 1,026 randomly selected...

COULD YOU HELP ME CHOOSE THE FORMULA NEEDED AND SHOW THE WORKS TO HELP CLEAR UP ANY OF MY CONFUSION. THANKS

A survey of 1,026 randomly selected Ohioans asked: "What would you do with an unexpected tax refund?" Forty-seven percent responded that they would pay off debts. 

20. Refer to Exhibit 8-3. The margin of error of the 90% confidence interval for the proportion of Ohioans who would pay off debts with an unexpected tax refund is

a.    0.950

b.    0.064 

c.    0.031 

d.    0.026 

21. Refer to Exhibit 8-3. The 90% confidence interval for the proportion of Ohioans who would pay off debts with an unexpected tax refund is 

1. [0.406, 0.534] 
2. [0.439, 0.501] 
3. [0.444, 0.496] 
4. [-1.96, 1.96]