HELP! 2 math questions that i've been stuck on for ages!! need answers quick!!

Question

anonymous · Answer

@jim_thompson5910 @satellite73 @henryarias5

anonymous · Answer

@LilyKitty

anonymous · Answer

@Directrix @cwrw238

preetha · Answer

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

anonymous · Answer

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

directrix · Answer

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

anonymous · Answer

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

anonymous · Answer

do you know the formula for r?

anonymous · Answer

no @pgpilot326

anonymous · Answer

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

anonymous · Answer

can you write it out? @pgpilot326

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

do you know what r is?

anonymous · Answer

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

anonymous · Answer

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.

anonymous · Answer

forgot an o.. sorry

anonymous · Answer

you still there?