### Home > GB8I > Chapter 4 Unit 5 > Lesson INT1: 4.2.4 > Problem 4-98

Data from a study of a vitamin supplement that claims to shorten the length of the common cold is shown below:

Number of months | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|

Number of days |

Determine the LSRL of this data again. Create a scatterplot on graph paper (or use your scatterplot from problem 4-56) and draw the LSRL.

Look at the Math Notes box in Lesson 4.2.1 to help you with LSRL graphs.

Is a linear model appropriate? Provide evidence.

Yes. Make sure you provide evidence for why.

Calculate r and interpret

in context.-squared Look at the Math Notes box in Lesson 4.2.4 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?