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

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

Number of months

taking supplement0.5

2.5

1

2

0.5

1

2

1

1.5

2.5

Number of days

cold lasted4.5

1.6

3

1.8

5

4.2

2.4

3.6

3.3

1.4

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

Is a linear model appropriate? Provide evidence.

Find

*r*and interpret*R-squared*in context.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?