12.2 There is an annual race to reach the top of Kendall Mountain in the small town of Silverton, Colorado. A health scientist believes that the time to reach the top has significantly changed over the past 10 years.

The average time for the first 12 runners to reach the summit in the 2005 race was 2.15 hours. He records the times for the top 12 runners in 2015 as follows: 1.43, 1.67, 2.13, 2.24, 2.45, 2.50, 2.69, 2.86, 2.92, 2.99, 3.35, and 3.36 hours, respectively. You must now write the null and alternative hypotheses in an attempt to produce evidence in support of your research hypothesis.