Discussion Thread: Crime and the Criminal Justice System

Complete the Data Highlights: Group Projects on page 629 of your Brase, Brase, Dolor, and Seibert textbook.

Discuss the following topics.

The Statistical Abstract of the United States reported information about the percentage of arrests related to DUI (driving under the influence) according to age group. In the table shown here, entry 3.7 in the first row means that in the entire United States, about 3.7 of all DUI arrests were in the age group 1617 years. The Freemont County Sheriffs Office obtained data about the number of drivers arrested for DUI in each age group over the past several years. In the table, entry 8 in the first row means that eight people in the age group 1617 years were arrested for DUI in Freemont County.

Use a chi-square test with a 5% level of significance to test the claim that the age distribution of DUI arrests in Freemont County is the same as the national age distribution of DUI arrests.

1. State the null and alternate hypotheses.
2. Find the value of the chi-square test statistic from the sample.
3. Find the degrees of freedom and the P-value of the test statistic.
4. Decide whether you should reject or not reject the null hypothesis.
5. State your conclusion in the context of the problem.
6. How could you gather data and conduct a similar test for the city or county in which you live? Explain.

Please note that the table that they refer to is in your text.