Question

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Use the following information to answer questions.
The results of a recent poll on the preference of voters regarding the presidential candidates are
shown below.
Voters Surveyed Voters Favoring This Candidate
Candidate A 200 150
Candidate B 300 195
1.Develop a 90% confidence interval estimate for the difference between the proportion of voters favoring each candidate. Enter the lower limit for the confidence interval, rounded to three decimal places.
2.Develop a 90% confidence interval estimate for the difference between the proportion of voters favoring each candidate. Enter the upper limit for the confidence interval, rounded to three decimal places.
3. Your 90% confidence interval allows you to draw which conclusion?
a. Candidate B is likely favored over Candidate A.
b. Candidate A is likely favored over Candidate B.
c. The confidence interval does not allow us to determine which candidate is favored.
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Answer 1

又看了下，题目的意思是想要估计两个候选人的民意区间是吧，给你个公式

π为A、B两人的样本比例，1-α=0.9，自己算算吧