Due 9pm Tonight - Stats Discussion Questions
At least one paragraph each should be given, discussing each answers .
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1. How Scattered Are We? |
a) Show us a scatterplot between two interval level variables.
(Use Excel to chart them)
b) Are the results bunched together or far apart? Is the relationship linear? Is the relationship non-linear? Is there no apparent relationship between the two variables?
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2. What is Correlation and Why Does it NOT Equal Cause? |
a) We use Pearson’s correlation coefficient as a measure of association between 2 continuous variables. Give some examples of where two concepts (variables) are correlated, but this does not imply a causal relationship between the two.
b) Can there be a causal relationship between two items but no correlation?
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3. How Can Regression Be Simple? |
a) Find a study with regression in it. Report on the model (the regression coefficient and the R-squared) and interpret the results:
b) By how much does the dependent variable change for a one-unit change in the independent variable?
c) Is the coefficient significant (i.e., is its t-score close to 2 or above, or does it have a p-value less than .05)?
d) Is the model powerful (e.g., what is the r-squared score and what does it mean)?