PSY 3303 Lecture 2: Topic 2

39 views4 pages
25 Mar 2018
Topic 2: Methods
Correlational study- observes the relationship between variables
(moving in the same direction is still a positive correlation)
Correlation coefficient: an estimate of
- direction of relationship
- strength (magnitude) of the relationship
Info in the correlation coefficients
- strength: coefficients: -1 to +1, 0=no relationship
- direction: positive (+) or negative (-)
**which correlation coefficient is large? -.8 or .6 → (-.8)
1. Variable A could cause variable B
A-----> B
Ex. ice cream causing drowning
2. Variable B could cause variable A
Ex. drowning causes increased in ice cream eating
3. Or a 3 variable could cause A and B
C→ A
→ B
Ex. Heat (when temp. Is higher outside we eat more ice cream and we go
swimming more often which may cause drowning.) ( A does not cause B)
Cross Sectional vs Longitudinal Designs
Cross sectional design: data are collected at one point in time
Unlock document

This preview shows page 1 of the document.
Unlock all 4 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
$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.