Aprofessor using an open-source introductory statistics book predicts that 60% of the students will purchase a hard copy of the book, 25% will print it out from the web, and 15% will read it online. at the end of the semester she asks her students to complete a survey where they indicate what format of the book they used. of the 126 students, 71 said they bought a hard copy of the book, 30 said they printed it out from the web, and 25 said they read it online. what would be the appropriate set of hypotheses for testing if the professor's predictions were accurate?