A random sample of 188 books purchased at a local bookstore showed that 66 of the books were murder mysteries. a. What is the sample proportion p ? (2 pts.) b. Let p represent the proportion of books sold by this store that are murder mysteries. Find a 90% CI for p. Round you answer to 3 decimal places. If you are using your calculator specify the inputs you used. (4 pts.) c. What is the margin of error for this interval? (2 pts.) d. Interpret this interval in context of this problem. (2 pts.)