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Consider the following statements about t and z-tests: I). The degrees of freedom in a t-distribution depend on sample size, and generally the degrees of freedom are defined as n-1. II). As sample size increases a t-graph begins to resemble a z-graph. III). For infinity degrees of freedom the critical values for a z-distribution can also be found on a t-table in the row that has infinity as its degrees of freedom. Which statement(s) is/are TRUE?