What is the mean number of arrests for sex offenders who offended against adults

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

Statistics in Criminal Justice

Homework 4

Each question is worth 2 points unless otherwise noted

1. When do we use a z test? Give an original example that is relevant to criminology or criminal justice.

2. Calculate the z score using the following data that reflect the number of support meetings attended weekly by current and historic mental health court participants. Show your work (three points).

Data: Sample size is 50, sample mean is 12, sample standard deviation is 1.9

Population size is 295, population mean is 10, population standard deviation is 2

3. Is the z score you found for Question 2 significant at the .05 level? Why or why not (three points)?

4. Write your findings for Question 2 in standard reporting style 

5. When do we use an independent samples t test? Give an original example that is relevant to criminology or criminal justice.

6. Using Chapter 11 Dataset 3, run an independent samples t test to determine whether there is a significant difference in the mean number of arrests for two types of sex offenders in the year after they participate in a CBT program.

Group 1 is sex offenders who offend against adults

 

Group 2 is sex offenders who offend against children

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