If the two conditions shown here are satisfied, the sampling distribution of the sample proportion will be approximately normally distributed.
The standard error formula is shown here.
If you don't know the true population proportion you need to use the standard error formula but replace π with the sample proportion (p) - as shown here.
7.4 Calculating the population proportion
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Transcript
If the two conditions shown here are satisfied, the sampling distribution of the sample proportion will be approximately normally distributed.
The standard error formula is shown here.
If you don't know the true population proportion you need to use the standard error formula but replace π with the sample proportion (p) - as shown here.