Anyone good at college level statistics???

I have a couple questions on this study guide that the teacher gave us, and I'm completely blanking on it...

I can't figure out how he's getting these numbersin the answers... ie: .0036, .032 etc.

Can anyone help?

 

I thought I was good at it until I saw this. Realized I forgot most of statistics.

 

D

 

The answer is C.

 

my last post was the grade i made in statistics last year.

 

#highschoolswag

 

Got an A in stats... and I remember nothing...

 

I think I got like a C+ in engineering statistics. Didn't try at all in that class. No curve like there should've been. The professor was a frickin grad student. First class he'd ever taught.

 

im "studying" for a college stat exam right now as well. Yours must be a harder class. Cant help you there, good luck though...

 

Looks to be binomial probabilty distribution. Uses a form of the combination fomula.

P(x)=nCxPi^x (1-Pi)^n-x
(not the best way to type a formula)


You should have a table in the back of your book that basicly gives you the answers.
C=combination
n=the number of samples, in this case 7
PI=the probibily of a success, in this case .55

 

C(7,0) is 7 choose 0, also known as binomial coeff. There's a function on scientific calculators for that...

 

not in high school..

 

Thats what I am having trouble with, like i see that these are the answers... but I dont know how the hell to compute it, its crazy

 

I am.

 

Mmm, still pretty sure it's a combination.

7 combination 0=


7!
_______

0!(7-0)!

 

I just had to go and check my transcript. Somehow I got a B in Business Statistics and remember nothing.

 

Just use WolframAlpha. For example, C(7,3) = 35.

http://www.wolframalpha.com/input/?i=c(7,3)

 

True,

but if you look at my first post that's only the first part of the formula...

 

think i got it, so to figure out those numbers you go 7 nCr 0 then multiply by the rest of the equation, and so on.... that was the hard part out of the way... then everything else is just plugging in crap... think i got this one after an hour lol

 

Sounds like you got it. They way he wrote the answer didn't make it clear he was doing the nCr combination stuff.