Question

The table below shows the velocity y, in miles per minute, of a toy car at different times x, in minutes:
Time (x)
(minutes) 10 20 30 40
Velocity (y)
(miles) 0.2 0.8 0.1 0.4

Part A: What is the most likely value of the correlation coefficient of the data in the table? Based on the correlation coefficient, describe the relationship between time and velocity of the toy car. (4 points)
[Choose the value of correlation coefficient from -1, 1, -0.04, 0.99]

Part B: What is the value of the slope of the graph of velocity versus time between 10 minutes and 20 minutes, and what does the slop

Answer 1

@StudyGurl14 and @geerky42 this one

Answer 2

first, graph the points

Answer 3

thank you for being so kind @StudyGurl14 :D

Answer 4

You're welcome :)

Answer 5

Yeah i found the correlation it is -0.4

Answer 6

All I wanted to know is how to describe the relationship between time and velocity of the toy car.

Answer 7

@geerky42

Answer 8

Oh I see. Do you know the slope formula?

Answer 9

Yes, y=mx+b

Answer 10

@StudyGurl14 All I wanted to know is how to describe the relationship between time and velocity of the toy car.

Answer 11

that's not the slope formula...

Answer 12

oh right

Answer 13

Just say things like "as time increases, the velocity of the car increases" etc. stuff like that

Answer 14

^Not that that statement in necessarily true...

Answer 15

But it doesn't increase

Answer 16

It was just an example

Answer 17

not something that is supposed to be true

Answer 18

Look at the table: Time (x) (minutes) 10 20 30 40 Velocity (y) (miles) 0.2 0.8 0.1 0.4

Answer 19

Since the correlation coefficient is a negative number, it indicates the graph has a negative slope and that the graph does not fit a line very well (that's it we are talking about linear correlation coefficient)

Answer 20

So what do you thnk it would be

Answer 21

@StudyGurl14

Answer 22

I just said above^

Answer 23

So as the time increases the velocity decreases?

Answer 24

@StudyGurl14

Answer 25

Hello?

Answer 26

No...this:
Since the correlation coefficient is a negative number, it indicates the graph has a negative slope and that the graph does not fit a line very well

Answer 27

No but this: describe the relationship between time and velocity of the toy car.

Answer 28

@StudyGurl14

Answer 29

@StudyGurl14 are you still there?

Answer 30

That is describing the relationship. It says "Based on the correlation coefficient, describe the relationship between time and velocity of the toy car."

Answer 31

the line that represent the relationship between time and velocity has a negative slope, meaning as time increases, velocity generally decreases

Answer 32

Ok thank you very much, now this part: What is the value of the slope of the graph of velocity versus time between 10 minutes and 20 minutes, and what does the slope represent? (3 points)

Part C: Does the data in the table represent correlation or causation? Explain your answer. (3 points)

Answer 33

For the first part (value of slope) use slope formula

Answer 34

@StudyGurl14 Okay, after my work I somehow got y=0.4-0.001x

Answer 35

@StudyGurl14

Answer 36

that's incorrect

Answer 37

ok than how would I do it?

Answer 38

@StudyGurl14