If anyone is taking the AP Statistics exam on Wednesday and wants to prepare with me, just come by! Got the Princeton review with me!!!!!

Question

If anyone is taking the AP Statistics exam on Wednesday and wants to prepare with me, just come by!  Got the Princeton review with me!!!!!

theopenstudyowl · Answer

Do you need help with a certain statistics concept?

amistre64 · Answer

something that always troubles me is when do we use standard deviation or standard error?

theopenstudyowl · Answer

The standard error is essentially the same thing as the standard deviation; the only difference is that the standard error is only used for samples.  If the problem clearly defines or hints that the data is a sample, then we would use standard error.  For the entire population, we would simply use standard deviation...

amistre64 · Answer

if seen questions such as:  a sample of 1000 was taken and the proportion 423 people liked cheese.  whats the probability that less then half the population likes cheese?

amistre64 · Answer

proportion was a mid thought, i was going for  423/1000 was the proportion, but changed my mind halfway thry typing it :)

theopenstudyowl · Answer

maybe a mutliplication or addition rule?  If you are familiar with such rules???

amistre64 · Answer

those dont apply here

theopenstudyowl · Answer

oh ok

amistre64 · Answer

to find the test statistic we would either do something like this
$$z=\frac{.5-423/1000}{\sqrt{\frac{423(1000-423)}{1000^3}}}$$

amistre64 · Answer

but it always gives me room to pause ...

theopenstudyowl · Answer

why do you pause?

amistre64 · Answer

lack of practice and a shaky understanding of when to do what.

theopenstudyowl · Answer

ok, you do seem to understand it better than me; as I am going to read the entire book tonight and then do practice tests tomorrow in preperation for wednesday #cramminglol

amistre64 · Answer

:)  good luck with it

amistre64 · Answer

a practice site i like is interactmath.com.  its free and simple,  just enter and pick a textbook to practice tons of problems out of.

theopenstudyowl · Answer

ok cool thanks!

theopenstudyowl · Answer

If anyone has any questions, just ask!

nnesha · Answer

i thought stat is soooooo hard

theopenstudyowl · Answer

nope!  Just got to get the right materials and read it lol, do you have any specific questions?

nnesha · Answer

anyways gO_Od luck!!!
AP & STAT :o

nnesha · Answer

nope sorry i don't like probability q ;3 sorry

theopenstudyowl · Answer

thanks! @Nnesha