Psychology
StephDiaz
Wee3Day1.pptxWeek 3, Day 1
PSY 3215 U01B 1215, Lab
Lab overview
Part I: Experimental Paper I
Demographics questionnaire
Quick overview
Part II: Working with SPSS
The basic layout
T-tests
Descriptive
Part I: Experimental Paper I
Demographics
A demographics questionnaire (DQ) collects facts about your study population
Helps increase internal validity
Internal validity – your evidence supports your claims
Gives you more information about your study population; more information better understanding
If you don’t find the effect you hypothesized, then looking at your demographics for trends can help you find answers (and vice-versa)
Demographics
Demographics should help you ask questions that are relevant to your study
These questions should either:
Reveal data that could complicate your study
Reveal data that could support your study
Demographic questions should have strong face validity – they need to be straightforward
All demographic questions should help give your more data to reduce the variability in your study population
Do this with clear, to the point questions
Demographics
Demographics
Demographics – Your section
Your demographic questionnaire will go in your appendix, at the end of your paper. See the checklist for more details
Needs to be relevant to the study: get details that can either help make the lines between your IV groups more clear or that could make them foggy
i.e. if you were doing a study on children’s vocabulary ability you would want questions that:
Look at how much reading time they get per week (this will probably enhance their score - direct)
Ask if they have an visual impairments (this will probably decrease their score – indirect)
Overview – Experimental Paper I
What you’ll need to add
An abstract
More lit. review (total papers needs to come up to 14)
Methods
Participants subsection
Materials and Procedures subsection
Appendix
Do you have the demographics questionnaire?
Part II: Working with SPSS
The basic layout
Data View
The basic layout
Variable View
The basic layout
The Toggle
The basic layout
Data can only be entered for existing variables
Variables have to start with a character (A-Z) and can’t have spaces
T-Tests
Go to: Canvas Modules Example Data
Download the In-Class T-test Practice Data
Open the file in SPSS
T-Tests
Go to: Analyze Compare Means Independent-Samples T-test
T-Tests
The window will look something like this:
T-Tests
First, move the score to the Test Variable box
T-Tests
Next move the Group to Grouping Variable Box
T-Tests
Time to define the groups!
T-Tests
Now hit ok and compute the t-test
T-Tests
A new window will appear. It has your results
Descriptives
Descriptives are the statistics used to describe your population or study data. Things like the average and standard deviation of your population’s age, or something like what are the frequencies of your sample’s gender (% female vs % male)
Descriptives
Going to Analyze Descriptive Statistics Descriptives
Try moving the age variable into the Variable(s) box to see details for the practice data set
