Question

PLEASE HELP ME SOLVE THIS PROBLEM (2 QUESTIONS). I WILL GIVE A MEDAL AND FAN!

Answer 1

I don't have a graphing calculator and really need help!

Answer 2

@Mehek14 @imqwerty @LynFran @nincompoop @Thadds2003

Answer 3

?

Answer 4

Ok

Answer 5

go to www.desmos.com/calculator
enter your table as the first entry.
enter \(y_1\)~\(~mx_1+b\) as the second entry.
That should give you the r value for your first question

Answer 6

Ok

Answer 7

What does the ~ mean? It's not working with it. @peachpi

Answer 8

I think its just a symbol they use to indicate approximation. Did you type it in directly?
You actually have to type it in, not copy and paste it. Use the underscore symbol to get the subscript. And make sure it's in a completely different entry from the table.

Answer 9

Idk what you mean @peachpi

Answer 10

Have you entered your table?

Answer 11

Yes

Answer 12

ok. Type this exactly into the 2nd entry:

y_1~mx_1+b

Answer 13

That didn't work

Answer 14

Ok, I think I got it now

Answer 15

But I had to use an equal sign, is that ok?

Answer 16

I guess so. Mine wouldn't work with the equal sign, I guess it should be ok.
Did it plot the dots and a line of best fit?

Answer 17

Not the line of best fit, only plotted the dots

Answer 18

ok, you don't really need it. Did it give you values for r, m, and b?

Answer 19

Just m, x1, and b. Is x1 r?

Answer 20

no. r is the answer to your first question. you need m and b to get the answer to your second question. Can you post a screenshot of what it gave you?

Answer 21

Ok

Answer 22

ok. I see. If you hit the plus sign at the top it lets you pull down the table. Use that to enter your numbers and then change your equation to the one with the ~ above.

Answer 23

Ok, I did all of that @peachpi Now what do I do?

Answer 24

now it should give you values for r, m, and b

Answer 25

Yes, but also r2

Answer 26

@peachpi What do I do with these values? Is the correlation coefficient 0.989 ?

Answer 27

yes correlation coefficient is r = 0.989

Answer 28

Use the m and b to write the equation you need to get to find the answer for part 2.
what did you get for m and b?

Answer 29

m is 2.0107 and b is 0.014286

Answer 30

so your equation is
y = mx + b

y = 2.0107x + 0.014286

Plug in 22 for x to get your answer

Answer 31

Is y=44.249686 correct? So the 2nd answer is C?

Answer 32

yes

Answer 33

Oh my gosh, thank you so much!!

Answer 34

you're welcome