# Statistic

 The flashcards below were created by user starvinmarvin623 on FreezingBlue Flashcards. hypothesis test for one population mean when sigma is known Z test assumptions:1. Simple random Sample 2. sigma is known 3. normal or large distribution test for 1 population mean when sigma is unknown T-test assumptions:1.Simple random Sample 2. sigma is unknown 3. normal or large n 2 population mean when standard deviations are the same Pooled t-test If the large S divided by small S is less than 2 it is still pooled assumptions:1. Simple random Sample 2. independent samples3. same standard deviations 4. normal or large n pooled t-interval assumptions are the same for 2 population mean pooled t test 2 population means when standard deviations are not the same non pooled t test assumptions: 1.Simple random Sample 2. independent samples 3. standard deviations are not the same 4. normal or large n paired t-test differences between populations make it a t test assumptions: 1. Simple random Sample 2. normal or large nnull: mu1=mu2 (difference is 0) alternative: mu1 <,>,not = mu2 chi squared/ chi squared goodness of fit always right skewed assumptions:1. all expected frequences are at least 1 2. at most 20% of expected frequencies are less than 53.Simple random Sample null: two variables are not associated alternative: they are associated Authorstarvinmarvin623 ID120735 Card SetStatistic Descriptionstatistics Updated2011-12-04T21:57:16Z Show Answers