### 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:

Number of months | 0.5 | 2.5 | 1 | 2 | 0.5 | 1 | 2 | 1 | 1.5 | 2.5 |

Number of days | 4.5 | 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

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

Is a linear model appropriate? Provide evidence.

Yes. Make sure you provide evidence for why.

Find

*r*and interpret*R-squared*in context.Look at the Math Notes box in Lesson 6.2.4 to refresh your memory about these values.

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*.Form: Is the association linear or nonlinear?

Direction: Positive or negative?