Temas Variados / Formulas De Probabilidad Y Estadistica

Formulas De Probabilidad Y Estadistica

Trabajos Documentales: Formulas De Probabilidad Y Estadistica
Ensayos de Calidad, Tareas, Monografias - busque más de 1.941.000+ documentos.

Enviado por:  Stella  20 mayo 2011
Tags: 
Palabras: 643   |   Páginas: 3
Views: 1072

...

tions 1. P(x) = [X8 P(x)] is calculated for each value of x. 2. Mean of a probability distribution: Il = E(x) = L[X8 P(x)] N!

= (N-R)!(R!)

Business Book Mall has material to enhance your career.

3. Variance of a probability distribution: V(x) = [LX2 8 P(x)] - [E(x)]2 B. Binomial distributions n is number of trials

X is number of successes

P(x ) =

x! (n-x)!

n!

P q

X n-x

where

P is probability of success

Iq, the probability

J npq

of failure, is 1 - P

C. Poisson distributions

P(x) = I1xe-11 X!

Il = np, 0'2 = npq and 0' = Il = np

where

Poisson approximation of the binomial requires n ~ 30 and np < 5 or nq < 5. 76

V. The continuous normal probability distribution A. To findthe probabilityof x being withina given range:

X-f..L

Z=cr-

Normal approximation of the binomial

requires n;;:: 30and both np and nq are;;::5.

The continuity correction factor applies.

B. To find a range for x given the probability: J..l::!: Z(J

VI. Central limit theorem Sampling

Distribution of the Means

P(x)

Excel Internet Library has learning materials classified by type of user.

~

J..l J..lx

MBA Internet Library will help with acceptance, graduation, and career advancement. Software Tutorial Internet Library has material to help with many popular software programs. Free Non-business Textbooks Library covers many subjects.

x

If n;;:: 30, the population may be skewed.

VII.Point estimates A.

xfor

f..l

B.

s for 0"

c.

p forp

D.

Sxforo"xwhere Sx=!n and o"x In =

VIILlnterval estimates

when n ;;::30

0-

A. For a population mean

XIZJii

or

5

Note: Use the finite correction factor in section VIII formulas

when n/N;?:.05.

N-1 J N-n

XIZJii

B. For a population proportion p -

+ z JP(1-P) ~

where

p

x

=fj

IX. Determining sample size A. When estimating the population mean

n

= (z;)2

Section VIII Note: Whenn < 30 and 0" is unknown, the t distribution, to be discussed in chapter 16, must be substituted for the z distribution when ma

king interval estimates. Many statistics software programs do all interval calculations, regardless of sample size, using the t distribution.

B. When estimating the population proportion

n=p(1-p>(~)2

77

...



Suscríbase a ClubEnsayos

Suscríbase a ClubEnsayos - busque más de 1.941.000+ documentos