[SOLVED] binomial

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January 29th 2007, 03:41 PM
nurserascal

[SOLVED] binomial

i am not understanding binomial experiments. :(

and how do you calculate expected value.

do you multiply the X list * the P(x) list.
add those values up.
ok. now that you have the total of that, are you supposed to / by the number of entries? :confused:

thanks for your help :D

the calculations of statistics seems easy enough. I am really struggling with what numbers to put where............
January 29th 2007, 04:41 PM
ThePerfectHacker

Quote:

Originally Posted by nurserascal

i am not understanding binomial experiments. :(

and how do you calculate expected value.

do you multiply the X list * the P(x) list.
add those values up.
ok. now that you have the total of that, are you supposed to / by the number of entries? :confused:

thanks for your help :D

the calculations of statistics seems easy enough. I am really struggling with what numbers to put where............

When you find how the probability when an event happens $n$ (a certain) number of times with a propability $p$ that is called a "binomial experiment" And the formula is,
${ m\choose n}p^n(1-p)^{m-n}$
Where $m$ is the total amount, meaning $n$ happens $n$ out of $m$ times.
January 29th 2007, 08:56 PM
CaptainBlack

Quote:

Originally Posted by nurserascal

i am not understanding binomial experiments. :(

and how do you calculate expected value.

do you multiply the X list * the P(x) list.
add those values up.
ok. now that you have the total of that, are you supposed to / by the number of entries? :confused:

There is no need to divide by the number of entries (all needed divisions
are already taken care of in the P(x) list which is the (usualy theoretical)
proportion of all cases which take the value x)

rONl