Step 1 :For a t-curve with df=13, we need to find the t-value \(t_{0.01}\).
Step 2 :We use a t-distribution table to find this value.
Step 3 :The t-value is calculated using the formula \(t_{0.01} = t.ppf(1 - alpha, df)\), where alpha is 0.01 and df is 13.
Step 4 :After calculating, we find that \(t_{0.01} = 2.6503088378527013\).
Step 5 :Rounding to three decimal places, we get the final answer: \(t_{0.01} = \boxed{2.650}\).