A survey of 400 students is selected randomly on a large univeristy campus. They are asked if they use a laptop in class to take notes. Suppose that based on the survey, 220 of the 400 students responded "yes".
a). What is the value of the sample proportion ^p ?
b). What is the standard error of the sample proportion?
c). Construct an approxinate 95% confidence interval for the true proportion p by taking +2SEs from the sample proportion.