1. Exemplar1 Two Variable Stats Presentation Ms. Kennedy MAP 4C Blood Pressure Versus Salt Intake

2. Exemplar2 Introduction A high salt intake can be a serious health concern. Lowering the amount of salt in your diet is a good way to stave off many serious heart-related problems. My hypothesis is that as people lower their salt intake, there will be a strong positive linear correlation to their blood pressure levels.

3. Exemplar3 Topics of Discussion A study of 15 patients who reduced their salt intake for 3 months was done. To prevent bias, no information about the patients is given. They had their blood pressure measured before and after. The results are shown in the table:

4. Exemplar4 Table 1: Raw Data Patient A B C D E F G H I J K L M N O Salt Reduction (g) 4.8 5.1 3.2 6.3 4.9 4.0 7.8 4.5 8.1 5.3 2.7 3.6 5.1 4.4 6.3 Blood Pressure Reduction (mmHg) 5.3 6.1 3.5 7.2 4.4 5.1 9.8 5.0 12.5 5.0 2.7 4.1 5.9 4.6 7.1

5. Exemplar5 Frequency Table This table shows the breakdown between the salt intake and blood pressure reduction Salt Reduction (g) TallyFrequencyB. P. Reduction (mmHg) TallyFrequency 2.0 – 2.9 3.0 – 3.9 4.0 – 4.9 5.0 – 5.9 6.0 – 6.9 7.0 – 7.9 8.0 – 8.9 | | | | | | | | | | 12532111253211 2.0 – 3.9 4.0 – 5.9 6.0 – 7.9 8.0 – 9.9 10.0 – 11.9 12.0 – 13.9 | | | | | | | | | | | | 245301245301

6. Exemplar6 Analysis Looking at the raw data and frequency table, there seems to be a pattern: The lower values for Salt Reduction, the less their blood pressure changed and vice versa.

7. Exemplar7 Bar Graphs Looking at the bar graphs, there seems to be a definite match in their overall distribution of data.

8. Exemplar8 Scatter Plot R² = 0.856 R = 0.925

9. Exemplar9 What This Means This confirms my hypothesis that there is a strong positive linear correlation since the correlation coefficient is 0.925, well into the “strong” range. However, the piece of data at (8.1, 12.5) leads me to suspect that this might be a curve. I would recommend further study. In conclusion, it seems clear that lowering salt intake will lower blood pressure.