# Statistics unit 7 assessment- relationships between variables

## Statistics Unit 7 Assessment- Relationships Between Variables

In this lesson, you will run a correlation between the resting and after exercising heart rates to determine if a linear relationship exists between the two variables and how strong the relationship is.Steps

1. Open the Heart Rate Dataset in Excel and identify the X-variable (resting heart rates for all 200 participants) and the Y-variable (after exercise heart rates for all 200 participants).
2. Use the Scatter Plot function in the Insert Charts section of Excel to create a scatter plot of the X and Y variables
3. Add a trendline to the scatter plot
4. Use the Data Analysis tools in Excel to find the regression equation.
5. In a Word document, describe the relationship between the X-variable (resting heart rate)and the Y-variable (after exercise heart rate).
• Graph the scatter plot with a trend line. Does it appear there is a linear relationship?  What does this mean?
• Calculate the correlation coefficient r using excel. Is this r (value) high compared to +1?  Based on the correlation coefficient is the relationship strong?
• Use excel to find the regression equation. Identify the slope.  What does it tell us in terms of our heart rate data?