Limited time offer 20% OFF StudySoup Subscription details

CSU - STAT 201 - Study Guide - Midterm

Created by: Jessica Namesnik Elite Notetaker

> > > > CSU - STAT 201 - Study Guide - Midterm

CSU - STAT 201 - Study Guide - Midterm

This preview shows pages 1 - 3 of a 8 page document. to view the rest of the content
background image Statistics Note Bundle Exam 1 Statistics 201 8/25/16 Statistics­ how data is collected, analyzed& interpreted  ­­descriptive statistics­ describes a dataset, the data itself don’t generalize the facts about  dataset to a larger group. ­­ inferential­ generalize (generalizations are called inferences), contain uncertainty.  Data­ information, takes the form of observed measurements or descriptions ­­Stats­ how we apply data to the real world ­­Variables­ items of interest, can take on different values, the type of measurement being taken Population­ entire overall group we are interested in  ­­Population of interest/target population­ i.e if we want average height of US girls, the  population of interest is US girls. Can be large or small. ­­Parameter­ # pertaining to a population (ie height of U.S. girls ­­Statistic – any # calculated using data to estimate parameters Sample – subset of entire population we collect data on, the variable of interest is  measured on them ­­Observation­ single member of a sample ­­Census­ measurements obtained from every member of a sample 
background image Conerns­> is the sample large enough, is the sample representative of the population of  interest?   Statistics 201 8/30/16 Bias­ if the statistic is made in a way that shows it might differ from the  population parameter it was meant to estimate.  ­­Sampling bias­ when the sample isn’t representative of the population of interest ­­Self selection bias­ when individuals select themselves. i.e: when voting for the most  talented musician and the musician votes for themselves. ­­Nonresponsive bias­  when certain types of respondants are more or less likely to  answer a survey honestly. i.e: high school kids raising their hands for a survey on  virginity. Simple random sample (SRS) – sample of a population where each unit of the  population has an equal opportunity to be selected. ­why? ­­ because it can help overcome self­selection bias and sampling bias Observational study­ variable values observed & recorded from already existing  data Controlled experiment­ researcher assigns members of study to different groups  which get different experimental conditions. ­­Treatment group­ undergoes the procedure ­­Control group­ does not undergo the procedure
background image ­­Placebo effect­ if a person believes a treatment will be beneficial, there is a chance  they might have the beneficial effect regardless of being treated or not.  Correlation­ doesn’t imply causation Confounding variables­ help explain data but is not accounted for in the study Blinding – an attempt to eliminate bias by not telling the treatment and control  group which is getting the treatment ­­Double­blinding­ neither the research groups or the researcher know which group is  the control and which is the treatment group.  9/01/16 Location­ where is the data set “ located” in a # line? Where is its center? Spread­ how dispersed is the data 5 number summary­ minimum and maximum, Q 1,  Q 3,  median ­Outliers­ any unusual values in the data set ­Shape­ what is the shape of the distribution of values in a dataset? ­Center­ mean and median ­­mean­ average, sum of data divided by sample size, denoted by an x with a line  above it ­­­ sample size # of obsrvations in a sample “n” mean = sum of data/ sample size ­­Median – if you put data #’s in order smallest to largest, the # in the middle is the  median, separates the upper 50% from the lower 50%

This is the end of the preview. Please to view the rest of the content
Join more than 18,000+ college students at Colorado State University who use StudySoup to get ahead
School: Colorado State University
Department: Statistics
Course: General Statistics
Professor: Xiaowen Hu
Term: Spring 2016
Tags: Statistics
Name: Statistics 201 Notes For exam 1
Description: This bundle contains all the notes from class leading up to 9/19/16. An easy way to access notes for preparing for the exam
Uploaded: 09/19/2016
8 Pages 25 Views 20 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
Join StudySoup for FREE
Get Full Access to CSU - Stat 201 - Study Guide - Midterm
Join with Email
Already have an account? Login here
×
Log in to StudySoup
Get Full Access to CSU - Stat 201 - Study Guide - Midterm

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 support@studysoup.com

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