A repeated-measures study finds a mean difference of MD = 5 points between two treatment conditions. Which of the following sample characteristics is most likely to produce a significant t statistic for the hypothesis test? 1. 1. a large sample size (n) and a large variance 2. a large sample size (n) and a small variance 3. a small sample size (n) and a large variance 4. a small sample size (n) and a small variance