Hopefully you all aced today's multiple choice questions...
Tonight for homework please answer the following four questions based on the data set below:
1. Sketch a scatterplot.
2. Is it appropriate to calculate the correlation? (Is a linear model appropriate?)
3. Describe the association between year and lean.
4. Find the equation for the line of best fit (least squares regression line).
The data set below gives measurements of the "lean" of the Learning Tower of Pisa for various ears. The "lean" represents the difference between where a point on the tower would be if the tower were straight and where it actually is. The data for "lean" are listed as "tenths of a millimeter over 2.9 meters." So, the 1975 lean of 642 means that in that year the lean measurement was 2.9642 (642 tenths over 2.9).
Also, don't forget we have a short quiz tomorrow on chapter 7! Here's what you need to know how to do...
- Create/sketch a scatterplot using your calculator
- Calculate r (on your calculator)
- Describe an associaton/correlation/scatterplot
- Identify mistakes (blunders) in statements about correlation
- Identify a potential lurking variable
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