Limited time offer 20% OFF StudySoup Subscription details

ISU - POL 138 - Class Notes - Week 10

Created by: Hope Terronez Elite Notetaker

> > > > ISU - POL 138 - Class Notes - Week 10

ISU - POL 138 - Class Notes - Week 10

This preview shows pages 1 - 2 of a 5 page document. to view the rest of the content
background image Statistical Inference What do we mean by inference? o Inference as the process of drawing conclusions  form observed data o Or, probabilistic statements about a population  based upon knowledge of a sample Point and interval estimation Hypothesis testing   Inference is not only about our confidence in  individual estimates   We may also use inference to test hypotheses about  relationships between variables o A common element here is the p-value o This value ranges from 0 to 1, and allows us to  make inferences from samples to populations o The logic: we compare our observed sample  data (and the relationships between X and Y) to  what we would expect to find if X and Y were 
unrelated in the population
o The p-value is the probability we would observe  the relationship in the sample data to random  chance o The lower the p-value, the greater our  confidence in our estimated relationship   Hypothesis Testing Coin toss example: assuming a fair coin tosser, the  chances of getting heads are the same as getting tails
  State a null hypothesis: o The coin toss is fair
background image o H 0 : P = 0.50   State an alternative, or research hypothesis: o The coin toss is not fair o H A : P  ≠ 0.50   The null hypothesis is your baseline; what you are  testing against The alternative hypothesis is your hypothesis   What does this look like? o Defining a critical region: Assume the null hypothesis is true Draw a sample form a population and  calculate the sample statistics Under the null, only a certain get of  outcomes of a random process should arise  regularly The critical region consists of the outcomes  that are so unlikely that if they occur we must 
reject the null hypothesis
  In theory, these choices are made in advance of any  data collection To start, collect a random sample Examine the test statistic to see if it falls into the  critical region o If yes, reject the null o If no, do not reject the null   Make an interpretation of the findings  

This is the end of the preview. Please to view the rest of the content
Join more than 18,000+ college students at Illinois State University who use StudySoup to get ahead
School: Illinois State University
Department: Politics
Course: Quantitative Reasoning in Political Science
Professor: Te-Yu Wang
Term: Summer 2015
Tags: Politics, POL138, politicalreasoning, and politicalscience
Name: POL 138 Week 10 Notes
Description: All of the notes from week 10 of class in POL 138
Uploaded: 10/27/2017
5 Pages 17 Views 13 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
Join StudySoup for FREE
Get Full Access to ISU - Pol 138 - Class Notes - Week 10
Join with Email
Already have an account? Login here
Log in to StudySoup
Get Full Access to ISU - Pol 138 - Class Notes - Week 10

Forgot password? Reset password here

Reset your password

I don't want to reset my password

Need help? Contact support

Need an Account? Is not associated with an account
Sign up
We're here to help

Having trouble accessing your account? Let us help you, contact support at +1(510) 944-1054 or

Got it, thanks!
Password Reset Request Sent An email has been sent to the email address associated to your account. Follow the link in the email to reset your password. If you're having trouble finding our email please check your spam folder
Got it, thanks!
Already have an Account? Is already in use
Log in
Incorrect Password The password used to log in with this account is incorrect
Try Again

Forgot password? Reset it here