Question

A professor using an open source introductory statistics book predicts that 20% of the students will purchase a hard copy of the book, 30% will print it out from the web, and 50% 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 156 students, 25 said they bought a hard copy of the book, 51 said they printed it out from the web, and 80 said they read it online. Round all answers to four decimal places. 1. State the hypotheses for testing if the professor's predictions were inaccurate. H0: The professor's predictions accurate. The difference due to chance. HA: The professor's predictions accurate. The difference due to chance. 2. Enter the expected values for the hypothesis test in the table below: Book Format Expected Value Hard copy 31.2 Print from web 46.8 Read online 78 3. Calculate the chi-squared statistic: .0482 4. Calculate the degrees of freedom: 2 5. Calculate the p-value: 6. Based on the p-value, we have: A. extremely strong evidence B. some evidence C. very strong evidence D. little evidence E. strong evidence that the null model is not a good fit for our observed data.

Answer 1