Ch 8 Sec 4

# Ch 8 Sec 4 - Chapter8Section4 ZTestforaProportion...

This preview shows pages 1–4. Sign up to view the full content.

Chapter 8 Section 4 Z  Test for a Proportion Mr. Kenneth Horwitz

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

View Full Document
z  Test for a Proportion Since a normal distribution can be used to approximate the  binomial distribution when  np   5  and  nq    5, the standard  normal distribution can be used to test hypotheses for  proportions.      The formula for the  test for a proportion is where ˆ - = p p z pq n ( 29 ˆ sample proportion population proportion sample size = = = X p n p n
Avoiding Trans Fats A dietitian claims that 60% of people are trying to avoid trans  fats in their diets. She randomly selected 200 people and found  that 128 people stated that they were trying to avoid trans fats in  their diets. At  α  = 0.05, is there enough evidence to reject the  dietitian’s claim? Step 1: State the hypotheses and identify the claim.   H

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 12/09/2011 for the course STATS 221 taught by Professor Nielson during the Fall '10 term at BYU.

### Page1 / 9

Ch 8 Sec 4 - Chapter8Section4 ZTestforaProportion...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online