Question

read the following description of a data set.
the math teachers at milford high school had never golfed before. they set up a friendly competition to see who would have the best round on a full course. the teachers practiced on a driving range the week before they played.
the statistics teacher tracked the number of hours practiced, x, and the final score, y, of each player.
the least squares regression line of this data set is:
$y = -8.421x + 139.656$
what score does this line predict for someone who spent 7 hours practicing on the driving range?
round your answer to the nearest integer.
points

Explanation:

Step1: Sustituir el valor de \(x\) en la ecuación

Dado que \(x = 7\) (horas de práctica), sustituimos \(x\) en la ecuación \(y=-8.421x + 139.656\).
$$y=-8.421\times7+139.656$$

Step2: Realizar la multiplicación

Calculamos \(-8.421\times7\).
$$-8.421\times7=-58.947$$

Step3: Realizar la suma

Sumamos \(-58.947\) y \(139.656\).
$$y=-58.947 + 139.656=80.709$$

Step4: Redondear al entero más cercano

Redondeamos \(80.709\) al entero más cercano.
$$y\approx81$$

Answer:

\(81\)