# Survey uncertainty with a given population proportion

#### milanoleonardo

##### New Member
Hello!

I have to estimate the uncertainty of the result of a survey where there sample size was defined to have an uncertainty of 2.76%, based on p a p value of 0.5.

The 2.76% error is calculated assuming a 50% population proportion, which is a worst case scenario assumption:

size sample 1260
confidence interval 1.96 (95 percent)
proportion: 50.00% error 2.76%

The result of the survey is 4%: with this population proportion what would be the error?:

size sample 1260
confidence interval 1.96 (95 percent)
proportion (p): 4.9% error ????

Thank you!