6.41 Open source textbook:  A professor 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 he asks his 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.
(a) State the hypotheses for testing if the professor's predictions were inaccurate.

(b) How many students did the professor expect to buy the book, print the book, and read the book exclusively online? (please do not round)
ObservedExpected
Buy Hard Copy71
Print Out25
Read Online15
(c) Calculate the chi-squared statistic, the degrees of freedom associated with it, and the p-value.
The value of the test-statistic is: (please round to two decimal places) The degrees of freedom associated with this test are: The p-value associated with this test is:
(e) Based on the p-value calculated in part (d), what is the conclusion of the hypothesis test?
Interpret your conclusion in this context.

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