For conducting a two-tailed hypothesis test with a certain data set, using the smaller of n1minus−1 and n2minus−1 for the degrees of freedom results in df equals=11, and the corresponding critical values are tequals=plus or minus±2.201. Using the formula for the exact degrees of freedom results in drf equals=19.063, and the corresponding critical values are tequals=plus or minus±2.093. How is using the critical values of tequals=plus or minus±2.201 more "conservative" than using the critical values of plus or minus±2.093