The sample proportion .
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How to estimate the sample proportion?</h3>
We know that the confidence interval for sample proportion exists estimated as;
90% confidence interval = Sample proportion Margin of Error
Here, let = sample proportion
Level of significance = 1 - 0.90 = 0.10 or 10% Critical value of z at 5% (two-sided) level of significance exists 1.645.
So, 90% confidence interval
From (1) and (2) , we get;
Simplifying the equation, we get
Now, squaring both sides, we get;
Now, putting value of n in (1), we get;
Simplifying the equation, we get
.
The sample proportion .
Therefore, the correct answer is option D. 0.25.
To learn more about confidence interval refer to:
brainly.com/question/17212516
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