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-   -   State the null and alternative hypotheses (https://www.askmehelpdesk.com/showthread.php?t=423958)

  • Dec 10, 2009, 06:13 PM
    sarah1004
    State the null and alternative hypotheses
    State the null and alternative hypotheses.
    Some previous studies found that college students averaged 8 hours or so per week on the internet. With more people owning cell phones we think that internet use has decreased maybe because of texting/twittering has increased. We want to test this hypothesis with some sample data from our class survey.
    3.0
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    2.5
    4.0
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    6.0
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    0.2
    3.0
    4.0
    1.0
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    1.0
    1.5
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    1.0
    2.0
    Please Please help I don't know how to do
    State the null and alternative hypotheses this..
    Please help me Thanks
  • Dec 15, 2009, 07:10 AM
    galactus
    Quote:

    Originally Posted by sarah1004 View Post
    State the null and alternative hypotheses.
    Some previous studies found that college students averaged 8 hours or so per week on the internet. With more people owning cell phones we think that internet use has decreased maybe because of texting/twittering has increased. We want to test this hypothesis with some sample data from our class survey.
    3.0
    1.0
    2.5
    4.0
    1.0
    2.0
    6.0
    4.0
    2.0
    3.0
    2.0
    2.0
    3.0
    4.0
    2.0
    0.2
    3.0
    4.0
    1.0
    2.0
    1.0
    1.5
    2.0
    1.0
    2.0
    Please Please help I dont know how to do
    State the null and alternative hypotheses this..
    Please help me Thanks


    At what alpha level are you supposed to test?

    Let's assume . That is a common one.

    The claimed mean is 8. Using your data, the smaple mean is 2.368 and

    the sample standard deviation is 1.3127. The sample size is 25.

    The claim is that it decreased, so we have a left tailed test.





    .

    Because the sample size is less than 30, we use the t-table.

    Looking it up, we see the critical value is -1.711.

    The test stat is certainly within the rejection region.

    With the given data, we REJECT the null hypothesis. We reject even at .0001 because the p value is so low. Since we reject the null hypothesis, then the claim holds water and it is decreasing.

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