Last updated: March 4, 2014

POLS 210

Exam 2 Review Sheet

 

This review is intended to give you a general idea of what may appear on the exam from the lectures listed below. The exam will cover material from the assigned readings and material that was presented in the lecture. 

1. Isolating the impact of main independent variable

Experimental studies

                        Experimental and control groups

                        Premasurement and post-measurement

                        Random assignment

Internal validity and external validity

            Laboratory experiments, field experiments, natural experiments, and controlled comparisons

2. Descriptive statistics

            Constructing a frequency table (Manual calculation)

            Histogram

            Percentages and proportions

            Measures of central tendency

                        Mean, median, mode

            Measures of variability (Dispersion)

                        Range, variance, standard deviation (Using N and N-1)

            Missing cases

            Low variation and high variation

3. Random sampling and sample sizes

            How many cases do we need?

                        Confidence level,

                        Accuracy (margin of error)

                        Variability

4. The normal curve

            Central limit theorem

            Z scores

            Finding areas under the normal curve

5. SPSS

            Frequency distribution, histogram, descriptive stats, recoding

6. Phases 2, 3

7. Operationalization

8. The z-table and the formulae for standard deviation and z-score will be provided.

   

 

 

2nd decimal of z

1st digit and 1st decimal of Z

.00

.01

.02

.03

.04

.05

.06

.07

.08

.09

0.0

.5000

.4960

.4920

.4880

.4840

.4801

.4761

.4721

.4681

.4641

0.3

.3821

.3783

.3745

.3707

.3669

.3632

.3594

.3557

.3520

.3483

0.6

.2743

.2709

.2676

.2643

.2611

.2578

.2546

.2514

.2483

.2451

1.0

.1587

.1562

.1539

.1515

.1492

.1469

.1446

.1423

.1401

.1379

1.2

.1151

.1131

.1112

.1093

.1075

.1056

.1038

.1020

.1003

.0985

1.3

.0968

.0951

.0934

.0918

.0901

.0885

.0869

.0853

.0838

.0823

1.5

.0668

.0655

.0643

.0630

.0618

.0606

.0594

.0682

.0571

.0559

1.9

.0287

.0281

.0274

.0268

.0262

.0256

.0250

.0244

.0239

.0233

2.0

.0228

.0222

.0217

.0212

.0207

.0202

.0197

.0192

.0188

.0183

2.3

.0107

.0104

.0102

.0099

.0096

.0094

.0091

.0089

.0087

.0084

3.0

.0013

.0013

.0013

.0012

.0012

.0011

.0011

.0011

.0010

.0010

 

10. Weighted average (Bonus points: 3 points)