Question

HELP PLEASE ASAP!
1. Which variable did you plot on the x-axis, and which variable did you plot on the y-axis? Explain why you assigned the variables in that way.

2. Write the equation of the line of best fit using the slope-intercept formula y=mx+b. Show all your work, including the points used to determine the slope and how the equation was determined.

3. What does the slope of the line represent within the context of your graph? What does the y-intercept represent?
4. Test the residuals of two other points to determine how well the line of best fit models the data.
5. Use the line of best fit to help you to describe the data correlation.
6. Using the line of best fit that you found in Part Three, Question 2, approximate how tall is a person whose arm span is 66 inches?
7. According to your line of best fit, what is the arm span of a 74-inch-tall person?

My plot:

68 inches 65 inches
68 inches 67 inches
64 inches 64 inches
36 inches 37 inches
61 inches 64 inches
69 inches 70 inches
65 inches 66 inches
70 inches 69 inches
62 inches 61 inches
71 inches 70 inches
64 inches 65 inches
70 inches 72 inches

Answer 1

@Arcadiouse @ane @Allison @Mehek

Answer 2

@Elsa213

Answer 3

@Vocaloid

Answer 4

@ThisGirlPretty

Answer 5

someoneee please help me :()

Answer 6

@natedawg246813579

Answer 7

@Vocaloid

Answer 8

@Mehek Help love?

Answer 9

please i beg you i really need help

Answer 10

@Vocaloid

Answer 11

@ThisGirlPretty werent u helping me yesterday? :)

Answer 12

Yes I was. @Arcadiouse Is a smarty in math :D

Answer 13

ok @Arcadiouse i really need your help bud

Answer 14

Hes helping in history he shoud be back sooner ;o

Answer 15

I am coming!

Answer 16

hehe ok thanks so much!!

Answer 17

So what do you need help with?

Answer 18

One second

Answer 19

i posted it above^^ :)

Answer 20

Well, what parts?

Answer 21

the questionss..... lets start with the first one

Which variable did you plot on the x-axis, and which variable did you plot on the y-axis? Explain why you assigned the variables in that way.

Answer 22

WHich variable do you want to be the x value?

Answer 23

Your x value can be the height or arm span. Personally I would make the height the X value.

Answer 24

ok so then x can be height :)

Answer 25

Ok, what is your reasoning?

Answer 26

i dont know

Answer 27

Ok, lets say x is always nondependable and y is the dependent. Why would height be non dependent?

Answer 28

Height is not the dependent so, with that being said arm span goes off of the height, so X would have to be the height while y is the arm span.

Answer 29

Part 1 is done.

Answer 30

ok great question 2:

Write the equation of the line of best fit using the slope-intercept formula $y = mx + b$. Show all your work, including the points used to determine the slope and how the equation was determined.

Answer 31

So, now we can do something like desmos. Do you know how to use desmos?

Answer 32

btw let me show you the scatter plot i created ... please let me know if its correct
http://prntscr.com/h4hnpw

Answer 33

Thats good

Answer 34

ok great! so now for #2:
Write the equation of the line of best fit using the slope-intercept formula $y = mx + b$. Show all your work, including the points used to determine the slope and how the equation was determined.

Answer 35

Now, to do this you should take two points that the line goes through

Answer 36

So choose two points that lye on the line

Answer 37

ummmmm
36 and 37??? im not sure

Answer 38

Oh god, lets go to desmos for this.

Answer 39

ok

Answer 40

https://www.desmos.com/calculator

Answer 41

go here and input the x and the ys for me

Answer 42

each row of height and arm span gets a separate box.

Answer 43

Don't forget the parenthesis.

Answer 44

When you are done, save it and grab the link for me :)

Answer 45

@cookiemonster

Answer 46

ill try but im not 100% what you mean

Answer 47

Ok, @ThisGirlPretty do you know how to run desmos?

Answer 48

YEEEE desmos girl :D

Answer 49

Please make me a line of best fit

Answer 50

Because what it seems like is he has a neutral plot and that won't work out :/

Answer 51

I got you ^_^

Answer 52

Thank you <3

Answer 53

No probs ^~^ give me a second :0

Answer 54

ok

Answer 55

Okie got it ;O

Answer 56

gahhh
link me to the graph

Answer 57

x'D Okie

Answer 58

ty

Answer 59

Np I think I did something wrong o.o https://www.desmos.com/calculator

Answer 60

;/

Answer 61

gotta save the graph

Answer 62

I'll create an account so I can save it then give it to you

Answer 63

ok lol

Answer 64

https://www.desmos.com/calculator/r3ibzbsqjb

Answer 65

@cookiemonster

Answer 66

Now to find the slow we find two points, I already have them (70,69) and (71,70)

Answer 67

ok then...

Answer 68

So now, we do 70-69/71-70 and get 1/1

Answer 69

So our slope comes to be 1

Answer 70

ok hold on can u answer it fully now like neatly... heres the question again

Write the equation of the line of best fit using the slope-intercept formula $y = mx + b$. Show all your work, including the points used to determine the slope and how the equation was determined.

Answer 71

We are working on the equation homie

Answer 72

oh ok hehe

Answer 73

Hold your horses, I am not giving you a direct answer, we are working through it together.

Answer 74

i know of course i was just lost but i get where we are by now

Answer 75

So, now they want it y=mx+b

Answer 76

ok....

Answer 77

@Arcadiouse

Answer 78

God, vocaloid I gtg. Could you help him @Vocaloid

Answer 79

aw man no please dont leaveeee :/ @Vocaloid unfortunately doesnt help me anymore i dont know why

Answer 80

Ill be on tomorrow if he doesn't help you

Answer 81

but i need it done now

Answer 82

@Arcadiouse hey there!!! can we please continue?

Answer 83

we were on question 2 :)

Answer 84

@Vocaloid Please help him.

Answer 85

@Arcadiouse she/he wont can you please im begging you i need this done already

Answer 86

@Arcadiouse

Answer 87

Ok, I understand you need help, but I am busy working on history problems and spamming me about the issue isn't going to help. Maybe try looking up how to make a line of best fit equation or tag some other people.

Answer 88

ok i understand, when ur done with history can you finish helping me though?

Answer 89

@ThisGirlPretty also, can you try and please finish helping me?

Answer 90

Yes, honestly cookie. You could solve these last two problems by just looking up how to make a line of best fit equation and inputting the numbers.

Answer 91

ok but im gonna wait for you.. i dont want to get anything wrong... let me know when ur done thank you!

Answer 92

It is going to be a while. I don't even know if I will get to it today sooo.

Answer 93

awww... :(

Answer 94

I am also not the best at math.

Answer 95

lol well you were doing fine... i just really need to finish this bud and even if ur not the best its better than me