Tuesday's Quiz:
- Vocab Section (all multiple choice):
- Scatterplot
- Explanatory (Variable)
- Response (Variable)
- Lurking Variable
- Correlation
- Remember, correlation only measures the strength and direction of a linear association
- Know how to determine if a correlation is strong/weak based on the r value
- Be able to compare r values and determine how two correlations are similar/different--determine which of two correlations is stronger/weaker
- Also be sure to know the "facts about correlation" (r doesn't change if we switch axes, doesn't change if we convert all data to z scores, doesn't change if we change units of x or y, and r doesn't have units)
- Positive Association
- Negative Association
- Y-Hat
- Open Ended Section:
- Describe an association (like the precip v. cucumber yield or ankle range v. balance score, or # missed classes v. exam score examples)
- Other possible questions:
- Identify mistakes in a correlation statement (like Friday's stamp)
- Identify a potential lurking variable (like Friday's stamp)
- Create scatterplot, find r, R^2, equation of line of best fit on graphing calc
- Review:
- Calculate a probability/% based on a Normal model (normalcdf)--focus is on showing work
- OR, find cutoffs given a % with a Normal model (invnorm)
After our quiz we'll get back to work with residuals--see you there!
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