Catalina read a report saying that the average daily high temperature in Buenos Aires a few years ago was . She believes that last year was warmer than this. To test her belief, she takes a simple random sample of 40 days from last year and records the daily high temperature on each chosen day. Let represent the average daily high temperature in Buenos Aires last year. Which of the following is an appropriate set of hypotheses for Catalina's significance test? Choose 1 answer: