Respuesta :
The sample proportion is 0.15 for an 80% confidence interval option (B) is correct.
What is a confidence interval for population standard deviation?
It is defined as the sampling distribution following an approximately normal distribution for known standard deviation.
We have an 80% confidence interval for a proportion.
Proportions are 0.12, 0.18
Since for the given sample, the confidence interval is symmetric to the mean value.
Mean of the 0.12 and 0.18
[tex]=\rm \frac{0.12+0.18}{2}[/tex]
[tex]=\rm \frac{0.30}{2}[/tex]
= 0.15
Thus, the sample proportion is 0.15 for an 80% confidence interval.
Learn more about the confidence interval here:
brainly.com/question/6654139
