BNAD 276 Study Guide - Midterm Guide: Confidence Interval, Test Statistic

• School: University of Arizona
• Department: Business Administration
• Course: BNAD 276
• Professor: Umashankar

Document Summary

10. 1: inference concerning the difference between two means (independent sampling) S1 and s2 are the sample variances. Df = n1 + n2 - 2: (cid:4666) (cid:2778) (cid:2779)(cid:4667) (cid:2202)(cid:2779) , (cid:2201)(cid:2778)(cid:2779)(cid:2778)+(cid:2201)(cid:2779)(cid:2779)(cid:2779) (cid:4666)(cid:3046)(cid:3117)(cid:3118) (cid:3117) + (cid:3046)(cid:3118)(cid:3118) (cid:3118) (cid:4667)(cid:3118) (cid:4667)(cid:3118) (cid:4666)(cid:3117) (cid:2869)(cid:4667) (cid:4667)(cid:3118) (cid:4666)(cid:3118) (cid:2869)(cid:4667) Df = if the population variances are unknown and can not be assumed equal if the population variances are unknown, but assumed equal. Test statistic for 1 - 2: if the population variances are known: (cid:3046)(cid:3047)(cid:3047)= (cid:4666) (cid:3117) (cid:3118)(cid:4667) (cid:3116) (cid:1871)(cid:2870)= (cid:4666)(cid:3117) (cid:2869)(cid:4667)(cid:3046)(cid:3117)(cid:3118) + (cid:4666)(cid:3118) (cid:2869)(cid:4667)(cid:3046)(cid:3118)(cid:3118) (cid:3117)+ (cid:3118) (cid:2870: (cid:1872)= (cid:4666) (cid:3117) (cid:3118)(cid:4667) (cid:3116) A 100(1- )% confidence interval for the mean difference is given by: (cid:1872)(cid:2870) ,( ) (cid:1872)= (cid:3116) (cid:4666)(cid:3046)(cid:3117)(cid:3118) (cid:3117) + (cid:3046)(cid:3118)(cid:3118) (cid:3118) (cid:4667)(cid:3118) (cid:4667)(cid:3118) (cid:4666)(cid:3117) (cid:2869)(cid:4667) (cid:4667)(cid:3118) (cid:4666)(cid:3118) (cid:2869)(cid:4667) 10. 2: inference concerning mean differences (matched-pairs sampling: df = n-1. Df = if the population variances are unknown and can not be assumed equal. 10. 3: inference concerning the difference between two proportions.