## anonymous 3 years ago HELP! 2 math questions that i've been stuck on for ages!! need answers quick!!

1. anonymous

@jim_thompson5910 @satellite73 @henryarias5

2. anonymous

@LilyKitty

3. anonymous

@Directrix @cwrw238

4. Preetha

It is a little difficult to see the problem. I suggest you close this and just type it out.

5. anonymous

You can click on it and zoom it in though.. @Preetha

6. Directrix

I see 3 problems. Which two of these do you want to work on? @icedancerfigureskater

7. anonymous

The two with charts attached, so 4 and 5. @Directrix

8. anonymous

do you know the formula for r?

9. anonymous

no @pgpilot326

10. anonymous

why not? seems you should know it or have access to it to do thses types of problems. i can write for you if you'd like but it might be better if you had it in a book

11. anonymous

can you write it out? @pgpilot326

12. anonymous

$r=\frac{ \sum{ xy }-n\bar{x}\bar{y}}{(n-1)s _{x}s _{y}}$

13. anonymous

wow okay so how can i use that to solve my first problem?

14. anonymous

do you know what r is?

15. anonymous

do you have a calculator... like a TI-83 or something similar?

16. anonymous

sorry... don't want to discurage you but there seems to be some people here who just want answers and aren't really interested in learning. it just seems to me if you're doing regression you should have an idea of what's what, like xbar and s_x etc.

17. anonymous

forgot an o.. sorry

18. anonymous

you still there?