handout_5_2

handout_5_2 - 5.2 The Sampling Distribution of a Sample...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 5.2 The Sampling Distribution of a Sample Mean Figure 5.8 •averages are less variable than individual observations •averages are more normal than individual observations The mean and standard deviation of x x = mean of sample, μ = mean of population , σ 2 = population variance select an SRS of size n from a population and measure variable X on each individual in sample the n measurements are values of n random variables- X 1 , X 2 … X n EX) Randomly select 100 women from the population and calculate their average height. •X i is measurement on one individual selected at random from population→ then X i has the distribution of the population •if population is large relative to the size of the sample→ X 1 , X 2 … X n considered independent Mean and standard deviation of a sample mean Let x be the mean of an SRS of size n from a population having mean μ and standard deviation σ. The mean and standard deviation of x are: x μ = μ x σ = n σ EX- length of service calls (...
View Full Document

This note was uploaded on 02/01/2010 for the course PAM 2100 taught by Professor Abdus,s. during the Spring '08 term at Cornell.

Page1 / 5

handout_5_2 - 5.2 The Sampling Distribution of a Sample...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online