8_1_Handout

# 8_1_Handout - 8.1 Inference for a Single Proportion...

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

8.1 Inference for a Single Proportion Large-sample confidence interval for a population proportion Choose an SRS of size n from a large population with unknown proportion p of successes. The sample proportion is: p ˆ = n X where X is the number of successes. The standard error of p ˆ is: p SE ˆ = n p p ) ˆ 1 ( ˆ - and the margin of error for confidence level C is: m =( z *)( p SE ˆ ) where z * is the value for the standard normal density curve with area C between – z * and z *. A approximate level C confidence interval for p is p ˆ ± m Use this interval for 90%, 95%, or 99% confidence when the number of successes and the number of failures are both at least 15.

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

View Full Document
EX 1) A survey of 17,096 students in US four-year colleges collected information on drinking behavior. The researchers defined “frequent binge drinking” as having five or more drinks in a row three or more times in the past two weeks. According to this definition, 3314 students were classified as frequent binge drinkers. Compute the 95%
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

8_1_Handout - 8.1 Inference for a Single Proportion...

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

View Full Document
Ask a homework question - tutors are online