In 2017, 15.5% of the United States population were people over 65. A researcher plans to use a sample of n - 2800 people to determine whether the population distribution has changed during the past 3 years. 1) State the Null Hypothesis for the work the researcher plans to do. 2) If a Chi-Square test is used to evaluate the data, what is the expected frequency for the older-than-65 category