NOTES! - 8-3 Testing a Claim Abt. A Proportion 17. In a...

This preview shows pages 1–2. Sign up to view the full content.

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.

Unformatted text preview: 8-3 Testing a Claim Abt. A Proportion 17. In a study of store checkout scanners, 1234 items were checked and 20 checked items were found to be overcharges, and 1214 checked iterms were not overcharves. Use a .05 significance level to test the claim that with scanners, 1% are overcharges. Based on these results, do scanners appear to help consumers avoid overcharges? 8-4 Testing a Claim abt a Mean: σknown13.Randomly selected statistics students participated in an experiement to test their aility to determine when 1 min(60s) has passed. Forty students yielded a sample mean of 58.3 sec. Assumin that σ=9.5 sec, use a .05 signifi. lvl to test the claim that the population mean equal 60s. based on the result, does there appear to be an overall perception of 1 min that is reasonably accurate? 8-5 Testing a claim abt a mean: σunknown 21. Patients with chronic fatigue syndrome were tested, then retested after being treated. A standard scale from –7 to +7 is used to measure fatigue before and after the treatment. The changed are summarized with: n=21, x(bar)=4, s=2.17. The changes were computed in a way that fatigue before and after the treatment....
View Full Document

This note was uploaded on 06/05/2008 for the course STAT 311 taught by Professor Tamrecardoso during the Fall '08 term at University of Washington.

Page1 / 2

NOTES! - 8-3 Testing a Claim Abt. A Proportion 17. In a...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online