'5 significance level' diaporamas de présentation

Economics 173 Business Statistics

Economics 173 Business Statistics. Lectures 5 & 6 Summer, 2001 Professor J. Petry. Inference About the Description of a Single Population. Chapter 11. 11.1 Introduction. In this chapter we utilize the approach developed before for making statistical inference about populations.

705 views • 67 slides

Review #2

Review #2. Chapter 9 Chapter 10 Chapter 11 Chapter 12. Chapter 9. A statistic is a random variable describing a characteristic of a random samples. Sample mean Sample variance

616 views • 49 slides

t-test

t-test. ?.?.???? ??????? ?????????. Steps of hypothesis testing. 1. State the null (H 0 ) and alternative (H a ) hypotheses. 2. Decide on the significance level (?) 3. Compute the value of the test statistic. 4. Decision to accept or reject H 0

803 views • 44 slides

Inference About One Population

412 views • 40 slides

Chapter 2

Chapter 2. Hypothesis Testing Test for one and two means Test for one and two proportions. Hypothesis Tests: An Introduction. We test a certain given theory / belief about population parameter.

420 views • 28 slides

Ch 11 ?? (2)

Ch 11 ?? (2). A Two - Tail Test. Example 11.2 AT&T has been challenged by competitors who argued that their rates resulted in lower bills.

594 views • 25 slides

Hypothesis Testing

322 views • 25 slides

UWHC Scholarly Forum April 17, 2013 Ismor Fischer, Ph.D. UW Dept of Statistics,

UWHC Scholarly Forum April 17, 2013 Ismor Fischer, Ph.D. UW Dept of Statistics, UW Dept of Biostatistics and Medical Informatics ifischer@wisc.edu. STATISTICS IN A NUTSHELL. UWHC Scholarly Forum April 17, 2013 Ismor Fischer, Ph.D. UW Dept of Statistics,

409 views • 25 slides

288 views • 21 slides

Inference as Design Target Goal: I can calculate and interpret a type I and type II error.

Inference as Design Target Goal: I can calculate and interpret a type I and type II error. 9.1c h.w: pg 547: 15, 19, 21. We use the results of a significance test to make a decision.

379 views • 20 slides

P-VALUE ON INFERENTIAL STATISTICS

314 views • 17 slides

Introduction to hypothesis testing

Introduction to hypothesis testing. Hypothesis testing is about making decisions Is a hypothesis true or false? Ex. Are women paid less, on average, than men?. Principles of hypothesis testing. The null hypothesis is initially presumed to be true

369 views • 12 slides

BA 275 Quantitative Business Methods

181 views • 11 slides

One sample Tests & Intervals on the Calculator

One sample Tests & Intervals on the Calculator. The ages of a group of volunteers were: 27, 16, 9, 14, 32, 15, 16, 13. The manager wants to show that the average age is less than the national average of 18. Test at a 5% significance level. Give the hypotheses:.

226 views • 9 slides

This is a left-tailed test Lets use ?=0.05 (5% significance level)

We want to test the claim that less than 15% of people have gotten a speeding ticket in the last year. We sample 400 people, and 13% of our sample has gotten a speeding ticket. This is a left-tailed test Lets use ?=0.05 (5% significance level).

315 views • 5 slides