This weekend, please complete the worksheet provided in class--more practice with influential points. Also, if you didn't turn in the classwork, please finish that for Monday. Also, in case you lost today's classwork OR were absent, I've uploaded the assignment (under classroom resources) entitled "Outliers and Influential Points: Age vs. Score
The homework questions are below:
The table below shows the average age at which women get married (in
the U.S.) versus year.
|
Year
|
1960
|
1965
|
1970
|
1975
|
1980
|
1985
|
1990
|
1995
|
|
Age
|
20.2
|
20.6
|
20.8
|
21.1
|
22
|
23.3
|
23.9
|
24.5
|
1.
Sketch
a scatterplot and a residual plot for the data provided in the space below.
Label your axes for each.
2.
Calculate the correlation coefficient,
coefficient of determination, and the equation of the LSRL.
3.
Add the point
(1977,24) to your data (and your scatterplot above). Now record the
correlation, coefficient of determination, and regression equation.
4.
Remove this point (1977,24). Instead, add (2010,22.5).
Record the correlation, coefficient of determination, and regression equation.
5.
Remove this point (2010,22.5). Instead, add (1968,18).
Record the correlation, coefficient of determination, and regression equation.
6.
Which point had the most influence on the
equation of the line of best fit? Explain your reasoning referencing each of
the statistics calculated above. (1977,24)
or (2010,22.5) or (1968,18)
Chapter 9 Reading Questions
1.
In your own words, what is extrapolation?
2.
In your own words, define leverage.
3.
What does it mean for a point to be influential?
4.
How can we define an outlier in a scatterplot?
5.
Define lurking
variable.
Also, in case you lost today's classwork OR were absent, I've uploaded the assignment (under classroom resources) entitled "Outliers and Influential Points: Age vs. Score."
And finally...don't forget....chapter 9 vocab test Monday!
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