11. Sociology: Age Distribution A sociologist is studying the age of the population in Blue Valley. Ten years ago, the population was such that 20% were under 20 years old, 15% were in the 20- to 35-year-old bracket, 30% were between 36 and 50, 25% were between 51 and 65, and 10% were over 65. A study done this year used a random sample of 210 residents. This sample showed Under 20 20–35 36–50 51–65 Over 65 26 27 69 68 20 At the 0.01 level of significance, has the age distribution of the population of Blue Valley changed?