Question

What does this question even mean? I don't want the answer, I don't even know what it is saying. What does it want me to do?

Q:
Test the residuals of two other points to determine how well the line of best fit models the data.

Answer 1

I have no idea.

Answer 2

Darn. Its the last question a long project I have for math, I've been on it for two days now, and all I need it to answer this. Can you tag any people that might know?

Answer 3

@hartnn @ganeshie8

Answer 4

whats your equation of best fit line ?

Answer 5

y=1.07x+1

Answer 6

and you must be having some datapoint as well ? share complete details in the main question so that others get to know what exactly you're looking for

Answer 7

Well, it is for a scatter plot, and I used the first point (58,59) and the last pint (73,74) to make the line of best fit. I don't know where to go from there.

Answer 8

Okay so what other points do you have ?

Answer 9

btw your best fit line is not matching with the points you have used

Answer 10

plugin (58, 59) and see if the equation satisfies

Answer 11

I got 59=63

Answer 12

I guess I am entirely wrong. :[

Answer 13

59 is never 63

Answer 14

My equation should be y=1x+1 right?

Answer 15

59=1x58+1

Answer 16

I dont know, the scatter plot is not precice enough to make out the points correctly

Answer 17

aren't you given them as ordered pairs ?

Answer 18

Arm span is x and height is y

Answer 19

So you want to use below for best fit line, right ?
`I used the first point (58,59) and the last pint (73,74)`

Answer 20

Yep.

Answer 21

aaah I wrote pint? I meant *point* >.<

Answer 22

I think I got it sort of cleared up, but I still don't know what the question want me to do. :p

Answer 23

Oh, I did this assignment..I'm pretty sure they want you to use GeoGebra.

Answer 24

thats okay :) slope =1 is right

Answer 25

yeah `y = 1x + 1` looks good for best fit line!

Answer 26

Now what do I do?

Answer 27

So you know that this line satisfies both first and last points accurately

Answer 28

so the first and last persons will be impressed with this best fit line as it correctly gives them their height if they just plugin the armspan

Answer 29

you need to see how accurately this best fit line matches the other people

Answer 30

pick any two ppoints from the table

Answer 31

So i just get two random points that I have and prove it works?

Answer 32

Oh okay. Gimme a sec to type.

Answer 33

it wont work for sure as it is just an "best approximation line"

Answer 34

you need to find out by how much error it fails

Answer 35

There's your line of best fit..

Answer 36

70=1x69+1
70=69+1
70=70

68=1x67+1
68=67+1
68=68

Answer 37

hey pick some point that doesnt work :O

Answer 38

just for a variety

Answer 39

the points you picked are matching exactly to the line and so the error residue is 0 for them

Answer 40

that just means your best fit line works perfectly for those two points

Answer 41

try the point (62, 62)

Answer 42

62=1x62+1
62=62+1
62=63

Answer 43

Darn >.<

Answer 44

I gtg. Bye.

Answer 45

Thank for the help!

Answer 46

so the residue is 63-62 = 1

your best fit line gives an error of 1 inch or about 1.6% which is pretty good!