1. in a two-tail test for the population mean, if we decided in favor of the alternative hypothesis when the null hypothesis is false, a. a correct decision is made b. a type ii error is made c. a one-tail test should be used instead of a two-tail test d. a type i error is made in a one-tail test for the population mean, 2. if we decide in favor of the null hypothesis when the alternative hypothesis is true, a. a two-tail test should be used instead of a one-tail test b. no error has been made c. a type i error is committed d. a type ii error is committed