Statistics with Probability

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  • FinalReview 7
  • December 12, 2012 at 9:31 pm #12963

    Ezra Halleck
    Participant

    7. Is TV watching among children related to being overweight?
    (col A: lbs overwt (or underwt), col B: hr/wk of TV watching).
    (a) Find the trend line and interpret the slope and y-intercept.
    (b) What is the correlation coefficient? How closely are the variables correlated?
    (c) What is the average number of lbs the children are overweight? How many hours of TV do they view per week on average?
    (d) Verify that the coordinate corresponding to the answers to c. lies on the trend line.

    December 17, 2012 at 5:51 am #16204

    mendozak
    Member

    Professor, I understand the gist of this problem but it cannot be solved as there is no data provided.

    (col A:) Where are the (lbs overwt / lbs underwt) samples?
    (col B:) Where are the (hr/wk of TV watching) samples?

    December 18, 2012 at 4:12 pm #16212

    Ezra Halleck
    Participant

    The data files are in the excel file on the “exams” page:

    Exams

    December 18, 2012 at 10:03 pm #16231

    Paris Sanders
    Member

    Hey Prof, I’m confused because I didn’t expect some of the weight scores to be negative. Even with some of the weight scores being negative do I still go about solving the problem the same way?

    December 18, 2012 at 10:09 pm #16233

    Ezra Halleck
    Participant

    The variables are pounds overweight (positive) or underweight (negative) vs tv watching time, so it does make sense for some of the data to have negative x components.

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