# IUB CJUS-K 300 - Exam 1 Study Guide (3 pages)

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## Exam 1 Study Guide

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## Exam 1 Study Guide

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Study guide overviewing lectures 1-5, includes equations for standard deviation and variance. Good Luck!

Pages:
3
Type:
Study Guide
School:
Indiana University, Bloomington
Course:
Cjus-K 300 - Techniques of Data Analysis
Edition:
1
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CJUS K300 1nd Edition Exam 1 Study Guide Lectures 1 5 Lecture 1 August 25 Simple Random Sample Steps Obtain a list of all members of the population Number all items participants on the list Decide on your desired sample size n Select numbers from a random number table or generator until desired sample size is obtained Systematic Random Sample Steps Obtain a list of all members of the population Number all items participants on the list Decide on your desired sample size n Select one random number from a random number generator Eg 10 Select every 10th number from the list until the desired sample size is obtained Random sampling is always Known Each persons probability is known ex 10 chance of being chosen Equal Each person has the same known probability of being selected Independent Each person has no effect on another or their chance of being selected Lecture 2 August 27 Levels of Measurement Nominal o All inclusive o Mutually exclusive each case must belong to only one group o No inherent order for the groups Ex Sex M F or F M the order it s presented makes no difference Ordinal o All inclusive o Mutually exclusive o Ordered but distance between two adjacent categories may vary Likert scale without numbers Interval and Ratio o All inclusive o Mutually exclusive o Ordered but there are equal distances or interval between any two adjacent categories Interval Likert scale with numbers below zero is arbitrary does not mean an absence ex Temperature Ratio Zero has a meaning which refers absence Lecture 3 September 3 Calculating rates divide the frequency by the number of people in the population f N Calculating standardized rates multiply each rate by either 10 100 1000 10 000 with the purpose of transforming your rated in to numbers which do not begin with a decimal Ratios are simply a means of comparing two entities Ex If there were 90 arrests for DUI and 30 for theft then the ratio to compare the two would be 3 1 Proportion divide the category frequency by the total

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