Before the review, I had no idea what the differnece was bewteen pt and t.test. Now I understand that pt test needs the test stat and degrees freedom to compute the pvalue. However, t.test only needs the data and the true mean you are testing against. It seems to me that it will be easier to use t.test since you dont need to do any further calcualtions. Also, it was helpful to understand that as n gets larger the t distribution will converge to standard normal distribution.