A biology professor predicted that 55% of the students will purchase a hard copy of the book, 15% will print it out from the web, and 30% will read it online. At the end of the term, he asked his students to complete a survey indicating the book format they used. Of the 300 students, 167 said they bought a hard copy of the book, 30 said they printed it out from the web, and 103 said they read it online. Apply the appropriate test to check if the professor's predictions were inaccurate.