3. Methodology

In both tests below, we assign  α=0.05. Here we incorporated Federica's suggestion using Chisq test for proportion because it is appropriate for testing hypotheses about proportions.
We also did one-tailed Z-test. Because when the sample size is large enough (defined as both np and n(1-p) are greater than or equal to 5), the binomial distribution comes to resemble the normal distribution. \citep{boslaugh2012}
In this analysis, we finally didn't use the t-test suggested by Ian, because the sample size is large enough. We used Z-test instead.