{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# 4 - October 4 2010 BUAD 310 Applied Business Statistics 1...

This preview shows pages 1–9. Sign up to view the full content.

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

View Full Document

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

View Full Document

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

View Full Document

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: October 4, 2010 BUAD 310: Applied Business Statistics 1 Outline for Today Two sample inference Two sample confidence intervals Two sample hypothesis testing 2 A Quick Review Hypothesis testing • One sample testing ( used to test the significance of a sample ) z test for a population mean when σ is known or for a population proportion One-sample t test for a population mean when σ is unknown • Two sample testing ( used to compare two samples each from a distinct group ) 3 Two Sample Problems Examples: • Do people with just a Bachelor’s degree earn less than those with a more advanced degree? • A bank wants to know which of the two incentive plans will most increase the use of its credit cards. It offers each incentive to a random sample of customers and compares the amount charged during the following six months. 4 Two Sample Inference The goal of the inference is to compare responses in two groups. • Each group is a distinct category in a population and will be referred to as a distinct population • The responses in each group are independent of those in the other group • Unlike the matched pairs design, there is no matching of the units in the two samples and the two samples may be of different sizes 5 Two Sample Inference Ways to compare two samples: • side by side histograms and boxplots • numerical summaries When both populations are symmetric and especially when they are approximately normal , it is a good idea to compare the mean responses in the two samples 6 Two Sample Inference 7 1. Comparing Two Population Means by Using Independent Samples: Variances Unknown 1. Comparing Two Population Proportions by Using Large Independent Samples Two Sample Inference 8 We want to compare the means either by giving a CI for μ 1 - μ 2 or by testing H : μ 1 = μ...
View Full Document

{[ snackBarMessage ]}

### Page1 / 23

4 - October 4 2010 BUAD 310 Applied Business Statistics 1...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online