Thirteen exercises from the book

Every problem here is an end-of-section exercise from Saylor's Introductory Statistics, chapter 6, reproduced word for word and labelled with its section and number — the ones we did not do in class. Type each answer, check it, take a hint if stuck, then read the full solution. Keep σ/√n unrounded, round z to two decimals and give probabilities to four, as the book does. X̄ and P̂ are the book's sample mean and sample proportion; the normal table is the book's cumulative normal table ↗. Parts that ask you to explain or interpret are answered in the solution.