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16 July, 18:50

A professor using an open source introductory statistics book predicts that 10% of the students will purchase a hard copy of the book, 55% will print it out from the web, and 35% 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 200 students, 25 said they bought a hard copy of the book, 85 said they printed it out from the web, and 90 said they read it online. (a) State the hypotheses for testing if the professor

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  1. 16 July, 18:51
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    Answer: The professor was not accurate with his hypothesis.

    Null hypothesis: P1 = 12.5%, P2 = 42.5%, P3 = 45%

    The alternate hypothesis: At least one proportion of the student will differ from the others.

    Step-by-step explanation: To check if the professors hypothesis were inaccurate.

    What percentage of student bought a hard copy of the book.

    (25 : 200) * 100 = 12.5%

    What percentage of the student printed it from the web.

    (85 : 200) * 100 = 42.5%

    What percentage of the students read it online.

    (90 : 200) * 100 = 45%

    This means that the professor was not accurate with his hypothesis. Because the proportion of student in his hypothesis was not the same in the actual.

    Therefore; the null hypothesis are

    P1 = 12.5%, P2 = 42.5%, P3 = 45%

    The alternative hypothesis will state that at least one of the proportion will be different from the others.
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