4. [10%] An online poll states that 50% people dislike a certain policy. For the next poll on the same topic, let61d3d8b9b9357.jpg be the point estimate of the true proportion61d3d8b9b9357.jpg ±2.5%? (Note:61d3d8f34cb08.jpgis the cumulative distribution function of a standard normal random variable Z. And 1.962 = 3.8416, 1.642 =2.6896, 1.282 =1.6384.)