Today in class, we:
- Reviewed how to "describe an association." (test question)
- Checked our homework answers (key below) and answered any remaining questions on the homework
- Watched the "AP Stats Guy" video about R^2 (check out the link on the right!)
- Started chapter 9 notes!
Here's a breakdown of tomorrow's test: 11 multiple choice, 7 open-ended (complete sentences), 2 "short answer"
- Know how correlation changes if we switch units, convert all x/y to z-scores (standardize), or switch the axes (r stays the same!)
- Find the equation of the LSRL:
- With a graphing calculator (given data)
- Algebraically
- Reading a cpu output
- Calculate a residual
- Identify which (of 5) statements has a mistake in interpreting r (correlation)
- Calculate a predicted value
- Identify the correlation given a scatterplot
- Interpret:
- Slope
- Y-intercept
- R^2
- Determine if a linear model is appropriate (check a scatterplot, residual plot, 2 quantitative variables)
- Describe an association (shape, direction, strength)
- Interpret the meaning of a coordinate pair (like the summer assignment question about temp. and ice cream sales)
- Identify points on a scatterplot with the largest/smallest x or y value
And lastly, here's a copy of the homework answer key so you can use it to study!
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