The following data represent the responses (Y for yes and N for no) from a sample of 20 college students to the question "Do you currently own shares in any stocks?" a. Determine the sample proportion, p, of college students who own shares of stock. b. If the population proportion is 0.40, determine the standard error of the proportion. a.p(Round to two decimal places as needed.) b. p-D (Round to four decimal places as needed.)