## Try this Heights and heart rate

This activity will allow you to use height and heart rate data to learn about correlation. This information will help you complete the CensusAtSchool 2013 questionnaire.

You will need

• Stopwatch
• Tape measure
• Eraser
• Red and blue pens
• Paper
• Copy of the scatter plot printout
• At least 10 people to survey

What to do

1. Measure your height with a tape measure. Write it down on a piece of paper.
2. Use a stopwatch to measure your resting heart rate. For instructions on how to take your heart rate, check out this Science by Email activity.
4. Have each other person measure their height and heart rate. Have them write these details, and their sex, on a piece of paper.
5. Collect everyone’s pieces of paper.
6. Look at the height on the first piece of paper. Get your scatter plot printout and find the height on the number line at the bottom of the page. Use a lead pencil to draw a line going straight up from that point.
7. Find the heart rate on the number line on the left side of the page. Use a lead pencil to draw a line going across from that mark until it meets the vertical line you drew last step. Draw an X at the intersection – use a red pen if you’re looking at a girl’s information, and a blue pen if you’re looking at a boy’s. Erase all the pencil lines, leaving just the X.
8. Take the next person’s information. Repeat Step 7 to plot a data point. Repeat this for every person’s information.
9. Draw an oval around the girls’ data points in red, and one around the boys’ data in blue.
10. Can you see a correlation between height and heart rate? Use the examples to the right to see what sort of correlation (if any) there is between height and heart rate.
11. Complete these sentences:

As boys’ height _________________, boys’ heart rate _______________.
As girls’ height _________________, girls’ heart rate _______________.

 Write your height, heart rate and sex on a piece of paper. Draw lines up and across in lead pencil to find the intersection. Draw an oval around the two colours of ‘x’s. In this example, there is a moderate correlation. There is no correlation in this set of points. This is a very strong correlation – almost perfect.
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