Question

Please help ASAP Payton collected data to show the relationship between the number of hours he practices and the number of errors he makes when playing a new piece of music. The table shows his data. Which is the approximate slope of the line of best fit for the data? –5.5 –4.5 –2.0 –1.0

Answer 1

B: -4.5

Explanation:

edg2021

y ≈ -4.548x + 43.714 is the entire equation. So -4.548 or -4.5 is the slope.

Answer 2

Option B.

Explanation:

The general equation of best fit line is

`y=ax+b`

where, a is the slope of best fit line and b is y-intercept.

Using graphing calculator a=-4.54762 and b=43.7143. So equation of best fit line is

`y=-4.54762x+43.7143`

Here,

`Slope=-4.54762`

`Slope\approx -4.5`

Note: In alternate method, you can use the below formula to find slope.

`m=\frac{\overline{x}\cdot \overline{y}-\overline{xy}}{(\overline{x})^2-\overline{x^2}}`

Therefore, the correct option is B.