Least-Squares Regression Line
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The table shows the number of hours \(x\) that five students spent studying and their exam mark \(y\) (%). The scatter plot shows the data with its least-squares regression line.
| \(x\) | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| \(y\) | 57 | 55 | 62 | 63 | 73 |
Use your calculator to find the gradient of the least-squares regression line.
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