# Finding critical value $t^*$ given a confidence level of $C$%, using the table with critical $t$ values

Assuming a table with a row per degrees of freedom and a column per upper tail probability
 Find the row with the appropriate degrees of freedom (df) Find the column for the upper tail probability equal to $\frac{1\,-\,C/100}{2}$ At the intersection point of this row and column, you find the critical value $t^*$