b ad 6243 applied univariate statistics
Download
Skip this Video
Download Presentation
B AD 6243: Applied Univariate Statistics

Loading in 2 Seconds...

play fullscreen
1 / 13

B AD 6243: Applied Univariate Statistics - PowerPoint PPT Presentation


  • 99 Views
  • Uploaded on

B AD 6243: Applied Univariate Statistics. Hypothesis Testing and the T-test Professor Laku Chidambaram Price College of Business University of Oklahoma. Steps in Hypothesis Testing. Determine hypotheses (null & alternative) Select significance level (  level/p level) Choose a sample size

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' B AD 6243: Applied Univariate Statistics' - lori


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
b ad 6243 applied univariate statistics

B AD 6243: Applied Univariate Statistics

Hypothesis Testing and the T-test

Professor Laku Chidambaram

Price College of Business

University of Oklahoma

steps in hypothesis testing
Steps in Hypothesis Testing
  • Determine hypotheses (null & alternative)
  • Select significance level ( level/p level)
  • Choose a sample size
  • Calculate the value of the statistic
  • Obtain critical value
  • Compare results

BAD 6243: Applied Univariate Statistics

errors in hypothesis testing
Errors in Hypothesis Testing

Sample (“Trial”)

Population (“Truth”)

BAD 6243: Applied Univariate Statistics

maxmincon principle
MAXMINCON Principle
  • Maximize experimental variance
    • Design, plan and conduct research so that the experimental conditions are as different as possible
  • Minimize error variance
    • Reduce error through controlling experimental conditions
    • Reduce error by increasing reliability of measures
  • Control extraneous variance
    • Randomization: Groups can be considered statistically equal in all possible ways
    • Selection: To eliminate the effect of an extraneous variable on a dependent variable, choose subjects so that they are as homogenous as possible (on that variable)
    • Addition: To control the effect of an extraneous variable, build it into the research design, so as to measure its effect on the dependent variable

BAD 6243: Applied Univariate Statistics

differences between groups
Differences between Groups
  • Randomized groups
    • Random sampling; random assignment
    • Simple vs. factorial designs
    • Concerns:
      • (Pre-experimental) equality of groups
      • Unequal cell sizes
  • Correlated group(s)
    • Use same units in different treatments
    • Single vs. multi-group designs
    • Concerns:
      • History, maturation and sensitization

BAD 6243: Applied Univariate Statistics

concepts related to the t test
Concepts Related to the T-test
  • Degrees of freedom
  • T-distribution vs. standard normal distribution
  • Level of significance
  • Between subjects design:
    • Equal sample sizes
    • Equal variance
  • Within subjects design

BAD 6243: Applied Univariate Statistics

standard normal distribution
Standard Normal Distribution

BAD 6243: Applied Univariate Statistics

t distributions
t Distributions

t-distributions refer to a family of distributions, which like normal distributions, are

bell-shaped, but whose shape changes with the sample size; smaller sample

sizes have flatter distributions, while larger sizes approximate normal distributions

BAD 6243: Applied Univariate Statistics

independent samples t test
Independent Samples t-test

BAD 6243: Applied Univariate Statistics

independent samples error bar
Independent Samples Error Bar

BAD 6243: Applied Univariate Statistics

t test as a regression model
T-test as a Regression Model

BAD 6243: Applied Univariate Statistics

dependent samples t test
Dependent Samples T-test

BAD 6243: Applied Univariate Statistics

dependent samples error bar
Dependent Samples Error Bar

BAD 6243: Applied Univariate Statistics

ad