In an explanation regarding the use of t tests, Zimmerman (2012) implied that power is greater for a test associated with n − 1 degrees of freedom compared to a test associated with N − 2 degrees of freedom assuming that the total sample sizes are equal (i.e., n = N). Based on the information provided,

(a) Which t test is associated with n − 1 degrees of freedom? Which t test is associated with N − 2 degrees of freedom?

(b) Referring to the t table, explain why the statement about power is true.