Class Activity #4

The following data represents the ages (in years) of seven men and their systolic blood pressures:

Age, x	16	25	39	45	49	64	70
Systolic BP, y	109	122	143	132	199	185	199

1. Use the TI-83 to help you construct the scatterplot. Label the graph.
2. Describe the overall pattern. Is there a direction to the relationship? If so, what is it? Is there an outlier?
3. Suppose the men aged 25, 49 and 64 were smokers and the others were non-smokers. Show this on your scatterplot.
4. Can you conclude anything about smokers and their systolic blood pressure? Why or why not.

Adapted from www.mathlab.isot.com/math/Statistics/Statlab4.pdf

ANSWERS:

1. Here's the scatterplot:
   
2. The overall pattern is somewhat linear. There is a positive association to the relationship? There does not seem to be an outlier.
3. We show the men aged 25, 49 and 64 (the smokers) by changing the square to a circle:
   .
4. No you conclude anything about smokers and their systolic blood pressure because there does not seem like there is a strong linear pattern among the smoker data – we would need more data.