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## PowerPoint Slideshow about 'correlation' - nell

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correlation

Are two variables related?

1. Do they move together or opposite?

2. How strongly?

(if they are strongly related, we can predict one from the other)

positive correlation

Variable 1

Variable 2

# of shoes you own

amt of credit card debt

move together, in same direction

Are shy people happy?

To a group of people, give a questionnaire about their degree of shyness.

To this same group, give a questionnaire about their degree of happiness.

Each person has two scores. Use correlation.

Is there a relationship between shyness & happiness? (Did one cause the other?)

example

Variable 1

Variable 2

ice cream sales

violent crime

Ice cream sales positively correlate with the occurrence of violent crime.

e.g.

example

Variable 1

Variable 2

# parties at your house

# of friends linked at Facebook

# parties at your house positively correlate with # of friends linked at Facebook

e.g.

correlation coefficient

NO ASSN

NEGATIVE

POSITIVE

-1.00 0 +1.00

= direction

+ / -

= strength

number

weak (0 - .40)

moderate (.41 - .69)

strong (.70 – 1.00)

real examples

Variable 1

Variable 2

+.90

height of twin #1

height of twin #2

+.50

marriage problems

behavioral problems in children

+.45

height of sister #1

height of sister #2

+.20

exposure to violent media

real-life violent behavior

-.40

amt of social support

frequency of illness

experimental research

Hypothesis:

Systematic desensitization therapy eliminates phobias.

DEPENDENT VARIABLE

INDEPENDENT

VARIABLE

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