A poll stated that 32% of those polled think economy is getting worse. An economist wanted to check this claim so she surveyed 750 people and found that 30% of them thought economy is getting worse. then if we are doing the 2 tail test and a= 0.05, the critical value should me +/-?
a) 0.95
b) 1.96
c) 1.65
d) 2.33
e) none of these