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Home > CCA > Chapter 7 > Lesson 7.1.1 > Problem 7-11

7-11.
  1. Data for a study of a vitamin supplement that claims to shorten the length of the common cold is shown below: Homework Help ✎

  2. Number of months
    taking supplement

    0.5

    2.5

    1

    2

    0.5

    1

    2

    1

    1.5

    2.5

    Number of days
    cold lasted

    4.5

    1.6

    3

    1.8

    5

    4.2

    2.4

    3.6

    3.3

    1.4

    1. You previously created linear models for this data in problems 6-24 and 6-55. Sketch the graph and the LSRL.

    2. Is a linear model appropriate? Provide evidence.

    3. Find r and interpret R-squared in context.

    4. Describe the association. Make sure you describe the form and provide evidence for the form. Provide numerical values for direction and strength and interpret them in context. Describe any outliers.

Look at the Math Notes box in Lesson 6.2.1 to help you with LSRL graphs.

Yes. Make sure you provide evidence for why.

Look at the Math Notes box in Lesson 6.2.4 to refresh your memory about these values.

Form: Is the association linear or nonlinear?
Direction: Positive or negative?