Question

Marcus runs 6 miles every day. He decides to collect data about his heart rate (beats per minute) while he runs. He takes a reading at the end of each mile. The scatter plot below shows this data. The red line was created to fit the data. Marcus will use the equation of the line for estimation and prediction.



Which of the following statements are valid representations of the meaning of the 80 in the equation of the line?

Answer 1

Valid Not Valid
A 80 is the predicted increase in the heart rate for every additional mile run.
B 80 is the slope of the prediction line.
C 80 is the predicted heart rate at the start of the run.
D 80 is the y-intercept of the prediction line.

Answer 2

ok so A is true
B is false because the slope is 10
C is true because that is where they start?
D is true because y=mx+b and b=yint

Answer 3

At 0 miles run, the guy's resting heart rate is 80 bpm.

Answer 4

yes

Answer 5

ok so A is true No

If his bpm went up by 80 each minute he ran, at the end of 6 minutes, his rate would be 480 bpm. Cardiac Arrest!

Answer 6

This is the same issue as with part A over at the golf course.

y = 10x + 80

After 1 minute, bpm = 10 + 80 = 90

After 2 minutes, bpm = 10*2 + 80 = 100

That looks like an increase of 10 bpm to me.

After all, the slope of the regression line is 10 so no surprise. that part A is False.

Answer 7

I agree with your other answers.

On my paper, I have

F
F
T
T

Answer 8

Go with True for part A if you think that is correct.

Answer 9

sorry bad connection and my computer freezing and showing google screen pop ups

Answer 10

i had no idea that amount of screens where possible lol

Answer 11

and again thank you so much for your help

Answer 12

Alrighty. My computer began to run hot. I had to hook up the fan for it.