A sociologist is studying the age of the population in Blue Valley. Ten years ago, the population was such that20%were under 20 years old,13%were in the 20- to 35-year-old bracket,32%were between 36 and 50,23%were between 51 and 65, and12%were over 65. A study done this year used a random sample of 210 residents. This sample is given below. At the 0.01 level of significance, has the age distribution of the population of Blue Valley changed?

Under 20 : 28

20 - 35: 27

36 - 50: 66

51 - 65: 65

Over 65: 24

(i) Give the value of the level of significance.

State the null and alternate hypotheses.

H₀: The distributions for the population 10 years ago and the population today are the same.

H₁: The distributions for the population 10 years ago and the population today are different.

H₀: Ages under 20 years old, 20- to 35-year-old, between 36 and 50, between 51 and 65, and over 65 are independent.

H₁: Ages under 20 years old, 20- to 35-year-old, between 36 and 50, between 51 and 65, and over 65 are not independent.

H₀: The population 10 years ago and the population today are independent.

H₁: The population 10 years ago and the population today are not independent.

H₀: Time ten years ago and today are independent.

H₁: Time ten years ago and today are not independent.

(ii) Find the sample test statistic. (Round your answer to two decimal places.)

(iii) Find or estimate theP-value of the sample test statistic. (Round your answer to three decimal places.)

(iv) Conclude the test.

SinceP-value <, we do not reject the null hypothesis.

SinceP-value, we reject the null hypothesis.

SinceP-value, we do not reject the null hypothesis.

SinceP-value <, we reject the null hypothesis.

(v) Interpret the conclusion in the context of the application.

At the 1% level of significance, there is insufficient evidence to claim that the age distribution of the population of Blue Valley has changed.

At the 1% level of significance, there is sufficient evidence to claim that the age distribution of the population of Blue Valley has changed.