We use the T - table to find the critical value of the T statistic.
Given data is:
Level of aignificance = 0.01
Degrees of freedom,df = 26
Now, we look at the value 0.01 for a one-tail test in the colum and df=26 in the row. The value corresponding to the intersection of these two is the required value of T statistic.
From the T table, for df=26 and significance level= 0.01 for lower one-tail test, the value of T statistic is t = -2.4790. (-ve sign because of lower tail test)
The T-table is attached below.
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