A student wants to test whether temperature has any effect on how quickly crickets chirp, so he sets up an experiment. He places 10 crickets in a dark room at 35 degrees Celsius and 10 crickets of the same species in a dark room at 31 degrees Celsius. He keeps all other variables (container, amount of light, type of food, gender of crickets, etc.) the same. For 5 days, he counts the number of chirps each cricket makes in the span of one minute and averages that number. Afterwards, he concludes that the warmer the temperature, the more quickly crickets chirp. Which of the following would provide the best representation of an ANALYSIS that compares the average number of chirps per minute at the two different temperatures?