05_anova

# 05_anova - Two-way tables and ANOVA: Outline Equivalence of...

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

Two-way tables and ANOVA : Outline Equivalence of the χ 2 test and two-population proportion tests. Two-population tests for means (review) ANOVA T. Parker () 1 / 14

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

View Full Document
Inference for two proportions Inference using χ 2 : for testing no association. What if there are only two groups? < \$20 \$20 Total Credit 27 63 90 Cash 9 15 24 Total 36 78 114 Assume H 0 : no association between cash / credit and small / big, and do this: Take one direction as your two populations — ex: take small / big purchases as populations. Expected number of credit card users determined by margins. Expected proportion of credit card users from each proportion? T. Parker () 2 / 14
Counts < \$20 \$20 Total Credit 27 63 90 Cash 9 15 24 Total 36 78 114 Proportions by purchase size < \$20 \$20 Credit .75 .8077 Cash .25 .1923 Total Test H 0 : p small = p big against H 1 : p small 6 = p big . z table Note: a quick way to ﬁnd ˆ p pooled from the table of counts. . . Last time we found the χ 2 test statistic was 0.49. ... Compare to the z statistic. Check the χ 2 0.05,1 critical value. χ 2 table Compare to the z .975 critical value. T. Parker ()

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 09/26/2011 for the course 06E 071 taught by Professor Stuff during the Spring '11 term at University of Iowa.

### Page1 / 14

05_anova - Two-way tables and ANOVA: Outline Equivalence of...

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

View Full Document
Ask a homework question - tutors are online