stat400lec30 - estimate of μ is ε n z σ ε α 2 =...

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

View Full Document Right Arrow Icon
Statistics 400 Section 7.6 Sample Size Calculation Review: Confidence Interval Form: estimate ± margin of error n z x σ α * 2 / ± n s t x * 2 / ± n n Y n Y z n Y ) / 1 ( / 2 / - ± The length of the interval = 2*margin of error Tow factors associated with width (length) of confidence interval (1) Sample size n (2) Confidence coefficient Maximum error of the estimate ( ε ) (1) The normal mean (2) The proportion Ping Ma Lecture 30 Fall 2005 - 1 -
Background image of page 1

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

View Full Document Right Arrow Icon
(1)The normal mean If X has a normal distribution N( μ , σ 2 ) where σ 2 is known, Find the sample size n so that we are 100(1- α )% confident that maximum error of the
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: estimate of μ is ε n z σ ε α * 2 / = Example : Let the tarsus length for a male grackle is normal distributed N( μ , 4.84). Find the sample size n so that we are 95% confident that maximum error of the estimate of μ is 0.4. Ping Ma Lecture 30 Fall 2005- 2 -(2)The proportion Let Y ~ b(n,p) Find the sample size n so that we are 100(1-α )% confident that maximum error of the estimate of p is ε n p p z ) 1 ( * * 2 /-= α ε Ping Ma Lecture 30 Fall 2005- 3 -...
View Full Document

{[ snackBarMessage ]}

Page1 / 3

stat400lec30 - estimate of μ is ε n z σ ε α 2 =...

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