PSY 203 Lecture Notes - Lecture 1: Null Hypothesis, Theoretical Definition, Confounding

24 views2 pages
10 Oct 2018
School
Department
Course
Professor
Lecture 1
Scientific method
- A series of steps to gather knowledge and to be as objective as possible
o No study is perfect
- Steps:
o Identifying a problem
o Form a hypothesis/prediction
A Good Hypothesis can be falsified
Null hypothesis
No difference in our groups of data
IV didn’t affect the DV
Any observed difference is the groups is due to chance/not real/Random variation.
The groups come from the same parent population
Null hypothesis testing
o Null hypothesis is what we assume
o Reject or retain the null
o Assume that there are no differences until evidence is gathered
Scientific/alternate hypothesis
Difference in our groups of data
IV affects the DV
Observed differences are Not due to chance (IV, confounding variable)
Groups come from different population
o Design and experiment/Descriptive research
Think about how to perform the experiment and what you need to do.
o Conduct the experiment
Gather the data
o Testing the hypothesis (using statistics)
o Communication of results (results section)
Data tables and graphs
- Advantages of the Scientific Method
o Trying to gather objective evidence (data); it’s as objective as possible; free from bias.
o Self-correcting
Through replication, if there is something wrong, others can help correct the mistakes.
- Goals of the Scientific Method
o Describe the world around us
o Predict (next stage)
o Explain how something works
o Control, how to fic something
Research Variables
- Variable
o Anything that can change. Ex, Drug usages, depression, mood
- Constant
o Does not change
- Theoretical definition
o Definition of a phenomena in abstract/general terms
o Cannot argue about it
- Operational Definition
Unlock document

This preview shows half of the first page of the document.
Unlock all 2 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
Monthly
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.