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Study Guide: Criminal justice 280 - Criminal justice, Research Methods by Professor Mark Lanier

by: Jazmin Dilligard

Study Guide: Criminal justice 280 - Criminal justice, Research Methods by Professor Mark Lanier Criminal justice 280

Marketplace > University of Alabama - Tuscaloosa > Criminal Justice > Criminal justice 280 > Study Guide Criminal justice 280 Criminal justice Research Methods by Professor Mark Lanier
Jazmin Dilligard
GPA 2.9
Criminal justice, Research Methods
Mark Lanier

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Criminal justice, Research Methods
Mark Lanier
Study Guide
Criminal justice 280, Criminal Justice, research methods, Mark Lanier
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This 3 page Study Guide was uploaded by Jazmin Dilligard on Monday October 12, 2015. The Study Guide belongs to Criminal justice 280 at University of Alabama - Tuscaloosa taught by Mark Lanier in Fall 2015. Since its upload, it has received 70 views. For similar materials see Criminal justice, Research Methods in Criminal Justice at University of Alabama - Tuscaloosa.

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Date Created: 10/12/15
Criminal Justice Study Guide Validity and Reliability The 3 Primary Purposes of Research 1 Exploration looking at a new problem or unresearched area 2 Description discovering the state of affairs in some area 3 Explanation why does something occur Crime unemployment etc The 2 Critical Issues that must be resolved with any research 1 Validity relates to accuracy are you measuring what you want to measure gt Validity refers to how well a test measures what it is purported to measure 2 types of validity 1 Internal what other variables may have accounted for the change 2 External How generalizable are your ndings 2 Reliability relates to the consistency at a measuring instrument gt Reliability is the degree to which an assessment tool produces stable and consistent results Sampling Notes lntrouductory Terms 1 Census when every element of a population is surveyed 2 Population the group of persons of elements to be studied 3 Sample selected elements from a population that will be observed in order to learn something about the entire population gt Study the sample and then make generalizations 4 Sampling Errors the amount of difference between the characteristics of the population and the sample chosen to study gt ANY AND EVERY SAMPLE WILL HAVE SOME DEGREE OF ERRORS THEY KEY IS TO 0 MINIMIZE THE ERROR 0 BE ABLE TO IDENTIFY THE AMOUNTS OF ERROR 5 Sampling Frame a list of all elements in the population to be studied 6 Sampling with replacement Odds never change Sampling without replacement Odds always change 2 types of Sampling Strategies 1 Probability Sampling 2 Nonprobability sampling Probability Sampling gt The most powerful sampling technique gt Allows you to determine the probability that any given element in the population will be included in the sample gt If you can determine the probability that then you can use inferential statistics Simple Random Sampling gt The most basic sampling technique gt Each element has an equal chance of being selected gt The problem is that you need to know what the sampling frame is which you often don t Steps to Simple Random Sampling 12 pts on Test 1 Draw up a list of all those in the population 2 Give them all a reference 3 Select a from a random number chart for a place to start 4 Move horizontal or vertical on random chart Strati ed Random Sample gt Used to make sure the same is representative of the population according to the distribution of an independent variable gt Divides into categories gt Randomly sample subpopulation Cluster Sampling gt Divide population into clusters based on some characteristics unrelated to theory gt Assign each cluster a gt Randomly draw of clusters often used in public polls What are the differences between strati ed and cluster sample gt Strati ed uses an independent variable where as clusters don t gt Strati ed must know some characteristics of the population where as clusters you don t gt Strati ed samples studies individuals where as clusters studies groups


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