CRJ 511

Homework Assignment #5

1. Use the Recidivism.xls data,conduct an independent sample t-test (alpha= .05) inExcel to determine whether there is a significant difference in AGE between those who recidivated (RECIDIVISM=1) and those who did not recidivate (RECIDIVISM=0). For this t-test, assume that the variances of the two groups are equal. Copy and paste the Excel output here. In your summary, please discuss the null hypothesis, alternative hypothesis, the result of this hypothesis test, and interpret the result.

1. Use the Recidivism.xls data,conduct an independent sample t-test (alpha= .05) inExcel to determine whether there is a significant difference in AGE between those who recidivated (RECIDIVISM=1) and those who did not recidivate (RECIDIVISM=0). For this t-test, assume that the variances of the two groups are unequal. Copy and paste the Excel output here. In your summary, please discuss the null hypothesis, alternative hypothesis, the result of this hypothesis test, and interpret the result.

1. Use the Recidivism.xls data,conduct an ANOVA (alpha= .05) inExcel to determine whether there is a significant difference in AGE across different CRIME (1=violent, 2=property, and 3=drug). Copy and paste the Excel output here. In your summary, please discuss the null hypothesis, alternative hypothesis, the result of this hypothesis test, and interpret the result.

recidivism custody person sex race age crime 27 3 1 Close 41 0 Medium - P NN 34 0 Minimum P 61 3 0 Medium 75 3 0 Close IN 0 Medium 3 1 Close W N S O O O V O UT A W N H 0 Medium NW 0 Close 2 0 Medium 0 Medium W N 0 Medium 0 Minimum 14 0 Minimum NN 15 0 Medium H N N N P P N N N N N N N P N N N N P N N P N P P N N ANN 16 2 1 Close 1 Medium 18 1 Medium 19 3 0 Medium 20 2 0 Minimum 21 2 0 Close 0 Close 23 0 Close 24 3 0 Close 25 1 0 Minimum 26 3 0 Minimum 27 0 Medium NN 28 55 0 Medium 29 54 0 Medium 30 71 1 Minimum