CRJ511 Applied Data Analysis in Criminal Justice

1.Produce a frequency table and a pie chart for RACE. Summarize the results.

 

2.Produce the mode, median, mean, standard deviation, variance, range, minimum, and maximum for JAILCREDIT and AGEADMIT. Report the results.

 

3.Construct a 95% confidence interval around the sample mean of JAILCREDIT and AGEADMIT, respectively. Interpret and summarize your results.

 

4.Assume that the average age of offenders at prison admissions in the state of Florida is 30. Use the data to perform a hypothesis test to determine if the average age of offenders at prison admissions in your sample is significantly different from the average age in the offender population in Florida. The variable that measures the average age of offenders at prison admission is AGEADMIT. Use a .05 level of statistical significance. Run the one-sample t-test in Excel. In your summary, please discuss the null hypothesis, alternative hypothesis, the result of this hypothesis test, and interpret the result.

6.Conduct an independent sample t-test (alpha= .05) in Excelto determine whether there is a significant difference in the length of jail in pretrial between White and Black offenders. For this t-test, assume that the variances of the two groups are unequal. In your summary, please discuss the null hypothesis, alternative hypothesis, the result of this hypothesis test, and interpret the result.

 

7.Conduct an independent sample t-test (alpha= .05) in Excelto determine whether there is a significant difference in the age of offenders at prison admissions between White and Black offenders. For this t-test, assume that the variances of the two groups are equal. In your summary, please discuss the null hypothesis, alternative hypothesis, the result of this hypothesis test, and interpret the result.

 

8.Conduct a Chi-Square test in Excelto determine if the race of offenders is independent of offense type. In your summary, please discuss the null hypothesis, alternative hypothesis, the result of this hypothesis test, and interpret the result.

 

9.Conduct an ANOVA test in Excelto determine if there is a significant difference in JAILCREDIT across offense types. In your summary, please discuss the null hypothesis, alternative hypothesis, the result of this hypothesis test, and interpret the result.

 

10.Correlate AGEADMIT and JAILCREDIT in Excel. Summarize your results and make sure that you briefly explain what this correlation means to you in terms of the impact of age on the length of jail in pretrial (direction of the correlation, correlation coefficient, and test of significance result).