Running Stats with R | A Full Analysis

I have only completed 2 full marathons so far in my life, and many halves. I love running and enjoy all the benefits that come with it. I was just recently cleared by my doctor to start running again after a long wait on some back issues I was experiencing. So I set a goal of getting back on the road in September. The thing is, I spent half of the month down in Brazil and I noticed a difference in my running pace. While Brazil's temperatures are definitely warmer than Canada in September (average of 26.8 C in Brazil versus 17 C in Canada), I also ran through a neighbourhood that has a lot of hills while down South. So, I decided to run some plots (no pun intended) and some statistical tests on the data using R for everything as a way of sharing with you all the cool things you can do for your Six Sigma projects using this incredible statistical program. Here's a quick look at the dataset: And here's my research question: "is there a statistically significant difference...