Criminal Justice 161-003
Spring 2003
Criminal Justice Statistics
Sequence of Topics and Readings and Assignments

NOTE: This page will be updated FREQUENTLY - be sure to check back at regular intervals.

DATE OF LAST UPDATE: 4/17/03

CLASS

TOPICS

READINGS

1/23

Why this is the most important class of your college career; what this class is about; what this class is NOT about; classroom guidelines; your innate statistical reasoning capabilities; your blocks; overcoming those blocks; survival guide; describing data; summarizing data; testing and developing ideas; evidentiary basis; initial orientation to spss

LAB FILE: Law enforcement officers killed: trends

B&P: 623-632

Math proves Stones best
click here
Gunface lyrics
Stats in your legal career?
PDF: lawyer
Your inner mathematician:
HTM: innermath.htm
BJS source page:
LEO Killed: 1973-2000
Data pages:
LEO_killed_2000

LEO_killed_weap_2000
Data file in SPSS:
leokweaptab2000.sav

1/30 What does it mean to reason statistically?
What is a variable? What flavors (only four)? Independent or dependent? The MATRIX approach. Counts, rates, ratios, percents; A PROBLEM: Background checks for firearms transfers. Describing data: Frequency distributions
LAB02
161sp03_lab02.wk1
HANDOUT:You are wrong because
PDF:backgroundchecks
B&P:1-9;22-39
K&F:1-23; 106-108 READ TWICE
G&S:1-13
How the average behaves in the bar

2/6

TEST ONE AT BEGINNING OF CLASS

Describing data: Frequency distributions;
Beginning to describe the CENTER of a variable: mean, median, mode. Spread: Max. and Min.

FINISH UP LAB02

G&S:14-18
B&P:44-65; 70-73 (skip smoothing) 81-90(skip median with grouped data); 91-96 (skip grouped data); 98; 100(last 2 lines)-107

2/13

PAPER 1 BASED ON LAB 2 DUE
Describing data: stem and leaf display; quartiles
Describing the SPREAD of data: range, IQR, mean deviation, standard deviation

CLICK HERE to retrieve spss data file with quiz 1 scores. Save it to your A floppy. You want to generate a BOX and WHISKER plot of these data.

B&P: 143-150; 117-130; 134-136
G&S:19-26

2/20

TEST TWO AT BEGINNING OF CLASS
More on describing the spread of data; thinking about what we are missing if we look only at measures of central tendency and spread; putting it all together; what is a random variable; what makes a random variable; what makes a random distribution; some distributions from the GUNS IN AMERICA data file (background); some distributions from CLASSINFO

LAB AND PAPER STUFF STARTS HERE
LAB03 AND PAPER 2: Box and whisker plots
giamindd.sav : SPSS Data file to retrieve and put on your A floppy

PDF: LUDWIG article

FYI: BACKGROUND CHECKS UPDATED DATA FILE: 161_sp03_bcft_poc.sav

B&P:150-163
The background on the Guns in America study
DOWNLOAD AND READ THIS OVERVIEW BY ROTH: click here

PDF: GIA CODEBOOK
DO **not** print out!! - just for online review!!

2/27

 PAPER 2  BASED ON LAB 3 DUE
M&Ms; Sampling and the distribution of sample means; two variables; sampling error

K&F:109-112

3/6

Sampling and M&Ms all over again

 B&P: 211-223
G&S: 79-86; 88;89-106;
REREAD: K&F:109-112

NOTE - TOPICS AND ASSIGNMENTS AND HYPERLINKS AFTER THIS DATE ARE ALL TENTATIVE  AS OF NOW - WILL BE UPDATED LATER IN SEMESTER

3/13

MTV SPRING BREAK

3/20

DELAYED QUIZ 3

Probability basics; Areas under the curve and central limit theorem; confidence intervals

LAB: Computing Z scores
 ABSOLUTELY VITAL THAT YOU READ K&F OTHERWISE YOU MAY BE LOST!

GET THE DATA TEMPLATE:

GET THE INSTRUCTIONS:

Link to class data file

G&S: 27-52
RECOMMENDED: B&P:169-184;: JUST THE BOXES

3/27

QUIZ 4

Applications in statistics I: Murder and Insurance Fraud

Probability basics; Areas under the curve and central limit theorem; confidence intervals - continued

B&P:211-232
G&S: 111-136

4/3

PAPER 3 DUE:

MURDER AND INSURANCE FRAUD 

Applications in statistics II: Election Fraud in the Second District in Philadelphia in 1993: background
Statistical TESTS: DIFFERENCES OF SAMPLE V. POP, DIFFERENCES OF TWO PROPORTIONS; The z-test of differences in proportions; the steps in the logic of hypothesis testing; understanding type I and type II error; in class example - is this class representative of national views on registering handguns?

Steps in hypothesis testing

Stinson1
Stinson2
Stinson3
Stinson 3A
Stinson4
Stinson5
Stinson6
Stinson7
Stinson8
Stinson9
Stinson10
Stinson Calculations

B&P: 259-286
G&S: 137-148

4/10

More on the z test and populations vs. samples; background to election fraud; constructing

LAB - constructing the spreadsheet to answer the question

ELECTION FRAUD LAB PAPER 4  

WORKSHEET FOR CALCULATIONS

 

4/17

QUIZ 5

PAPER 4 DUE

Association of nominal variables: contingency tables
How to construct a table; column percentages; expected frequencies; chi square and phi

CLICK HERE for syntax file

LAB 8: : getting ready to do a chi squared

Contingency tables; Chi squared statistic

B&P: 292-307(middle);
G&S:140-141; 151-152
K&F: 100-105

4/24

 t test of mean differences on independent samples

B&P:342-364

5/1

t test of mean differences on independent samples

SYNTAX BOX

YOUR ASSIGNMENT, Mr. Philips - download and save and work on it

B&P:342-364

 

LAST DAY OF TEMPLE CLASSES 5/5
STUDY DAYS 5/6, 5/7

THURSDAY 5/8 - FINAL EXAM AND COMPETENCIES ASSESSMENT