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

Answer:

Option B.

Step-by-step 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.

$m=\dfrac{\overline{x}\cdot \overline{y}-\overline{xy}}{(\overline{x})^2-\overline{x^2}}$

Therefore, the correct option is B.