Determine the critical value of t in the following circumstance: 1-alpha=0.99, n=10
t9 = 2.2498
t9 = 3.2498
t9 = 1.2498
t9 = 4.2498
If 1 - alpha = 0.99, then alpha = .01
Degrees of freedom is n - 1, which would be 9 in this case.
Check a t-distribution table. You should be able to narrow down the value from the data given.