STATS
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1
Define Outliers
Unusual observations
2
What else can you call the y variable?
Response/predicted/dependent variable
3
Give a brief explanation of a scatterplot
A scatterplot is a graph of the relationship between 2 quantitative variables. If you have an explanatory and response variable put the explanatory variable on the X axis of the scatterplot.
4
What else can you call the x variable?
Explanatory/predictor/independent variable
5
What is correlation usually written as?
r
6
What does the value of correlation(r) usually range ?
between -1 and +1
7
What does correlation give us?
Correlation tells us the relationship exists but does not tell us how or why the relationship exist. Correlation does not imply causation.
8
A negative r indicates a _____ association between the variables
negative
9
What does correlation ignore?
Distinction between explanatory and response variables
10
What can correlation only describe?
Straight line associations between 2 variables, no curved relationships.
11
A _____ r indicates a positive association between the variables
positive
12
What is the square of correlation(R^2)?
Coefficient of determination
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