21 With a 0.05, what is the rejection region for hypothesis test to see if the mean is less than 7 with a sample size of 36? z>1.645 and z<-1.645 t<-2.03 t<-1.69 t>2.03 and t<-2.03 t>1.69 and t<-1.69 t>1.69 t>2.03 z<-1.645 z>1.96 z<-1.96 z>1.96 and z<-1.96 z>1.645

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