# Margin of error for stratified survey sample

#### speegster

##### New Member
Hi all, first-time poster here.

I have a stratified sample of respondents to a survey with the following make-up:

So the total population is 7468 (and the total sample size is 1,008).

I have also applied a set of weights to the data, which yields the following effective sample sizes:

The effective total sample size is 727.

What I'm trying to find out is the margin of error for a sample proportion of 0.5 for the WHOLE weighted sample at the 95% confidence level (I can work it out for each of the strata). Can anyone help me?

We can assume the data is normally distributed due to the central limit theorem.

Also respondents were selected via a stratified disproportionate quota sampling design: stratum 5 was oversampled and stratum 6 was undersampled to accommodate (not sure if this makes a difference).

I've Googled this and nothing at all definitive comes up.

Many thanks in advance for any advice!