Answer to Question #32117 in Statistics and Probability for Furber

Question

I'm lost on this, so any guidance, tips, advice, gentle nudges in the right direction would be so appreciated. Please help me understand how would I go about knowing where to get the information I need to answer the following question. I have PHStat and the Excel Stats Plugins if necessary:

Henry performed a two-tailed test for an experiment in which N=24. He could not find his table of t critical values, but he remembered the tcv at df=13. He decided to compare his tobt with this tcv. Is he more likely to make a Type I or Type II error in this situation?