# PI - Correlation

What does a correlation study do?
Investigate whether there's a relationship between co-variables.
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What is a positive correlation?
As one co-variable increases, so does the other.
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What is a negative correlation?
As one co-variable increases, other decreases.
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What is no correlation?
No relationship between co-variables.
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What is two-tailed correlational hypothesis?
'there will be a significant correlation between... (doesn't show direction)
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What is a one-tailed correlational hypothesis?
'there will be a significant positive/negative correlation between...'
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What's a null hypothesis?
'there will not be a significant correlation between... any relationship will be due to chance factors.
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What is correlation co-efficient?
Whether the relationship is positive or negative and strength between +1 & -1
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Doesn't justify effect on co-variable, doesn't justify hypothesis/direction.
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What are findings? x4 examples
Raw data - mean. median, mode, outlier
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Give x2 conclusion examples
Positive/negative/no correlation, range values fall between.
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Tell us something new, Useful when variables can't be manipulated, Good starting point for research.
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Don't tell anything about cause and effect, Inferential statistical tests don't always pick up on a relationship.
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## Other cards in this set

### Card 2

#### Front

What is a positive correlation?

#### Back

As one co-variable increases, so does the other.

### Card 3

#### Front

What is a negative correlation?

### Card 4

#### Front

What is no correlation?

### Card 5

#### Front

What is two-tailed correlational hypothesis?