4. (10 marks) In an unmoderated usability test of an automotive website, 150 out of 180 participants correctly answered a qualifying question at the end of a task to demonstrate they had successfully completed the task 1. 17| Construct a 95% confidence interval for the true proportion of participants who demonstrated they had success fully completed the task. B. 13, How many people should be selected so that the width of the confidence interval is at most 10% and the confidence level is 90P6? Assume that no previous information is provided