2103 Chap 7 TwoSampleTests Nov 17, 19,22, 24 FALL 2010

2103 Chap 7 TwoSampleTests Nov 17, 19,22, 24 FALL 2010 -...

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Sec 7.1): Introduction Sec 7.2): T-Test of Means from Two Independent Sec 7.3) T-Test of Means from Two Matched Pairs Sec 7.4) Z-Test of Proportions from Two Samples Omit: all Confidence Interval Formulas in Chapter 1) T-Test of Means from Two Independent S n1, n2 with Xbar1 and Xbar2, respectively When Applied? Quantitative Dat Two Samples, that are "indepen e.g., Compare Ave Salaries of In n1=Pfizer, n2=Merck Pfizer Merck Random Joe Jed Assign? Sue Ned 1,000 volunteers Bud Biff X=Chol Sal Fluffy Ted Jon Muffy Hannibal Mean1 Mean2 n1=500 n2=500
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[Ignore Conf Interval Formulas for all 2 sample m 2) Test of Means from Two Paired (aka, Dependen Pre-Test Post-Test Pfizer Pfizer Diff's Pair1 Joe T1 Joe T2 Joe1 - Pair2 Sue Sue Sue1-S Pair3 Bud Bud etc. Pair4 Sal Sal Pair5 Ted Ted Pair6 Muffy Muffy Which method is appropriate? We want to compare Mean life of Incandescent to Flour Abuse of Pfizer's Merck's Matched Pairs DrugA(T1) DrugB(T2) Diff's Pair1 Joe Joe ???
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Pair2 Sue Sue ??? Pair3 Bud Bud Pair4 Sal Sal Pair5 Ted Ted Pair6 Muffy Muffy 3) Z-Test of Proportions from two samples (2 inde Type of Data? Non-Numeric (i.e., Categorical, or Q Number of Samples? Two (three or more calls for Application 1) Favorability Ratings for Obama in Repub's (Gro Adding a 3rd group, such as Independents(Group ChiSquare methods introduced in Chapter 16 2) Rate of Promotions in Group1(Majority) versus Prop who have received Promotions in Gro Human Resources and EEOC compliance Walmart (Email EC….what groups were com Send me URL's and cut and pas Protected Groups: Over 40; Gender;
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Samples s (Dependent Samples) s (2 independent samples only) r 7 Sample Means ta (numeric) dent" of one another nterns at Pfizer to Merck Temple Drexel X1 X1 X2 X2 X3 X3 etc etc MeanT MeanD
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ethods] nt) Samples (Matched-Pairs) Pre-Post Test Design Chol Change - Joe5 Weight Loss -Sue5 Strength Training Accident Rates Impact of Interventions can be evaluated Sales Training etc. rescent Bulbs Dependent Sample Design Is not a Good Choice Here Carry Over Effects
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Randomly Assign Employees to Only ONE of Two Methods, and compare the Group Means History, Time ependent samples only) Qualitative) r Univariate ChiSquare) roup1) vs Dem's (Group2) p3), would require s Group2(Protected) oup1 versus Group2 mplainants) ste into email
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Type Of Data: Numeric Data (Quantitative) B/c calculation of the mean Ttest for One Sample Mean (Sigma Unknown) Non-Numeric Data (Series of 0s, and 1s, or 1s, and 2s, a Ztest for One Sample Proportion (Non-Numeric Data, Qu Chapter 7: Tests for Two Samples 1) Ttest for Difference between Two Independent Sampl 2 Samples are drawn from two completely differe e.g., Random Samples of Grads from Temple vs D Mean Salary 5 years post-graduation The Null would indicate no signif difference in Me The alternative could indicate a significant differe TempleSAT DREXSAT Xbar1 Xbar2 2) Ttest for Difference between Two Dependent Means ( Matched Pairs or Repeated Measures SAT1 minusSAT2 equalsChange
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This note was uploaded on 03/29/2011 for the course STAT 2103 taught by Professor Pred during the Fall '10 term at Temple.

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2103 Chap 7 TwoSampleTests Nov 17, 19,22, 24 FALL 2010 -...

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