Tuesday...

Today we had our last test of the quarter...hopefully you aced it! I'm hoping to get them all graded tonight; no promises though. You will have them by Thursday at the absolute latest.

If you were absent today you will have to make up the test tomorrow or Thursday (or you will get a 0). If you do not have a study hall or cannot come after school, you will have to take the test during class time.

Tomorrow we'll start talking about chapter 9, and exploring outliers and influential points!

Tonight, for homework, please complete the worksheet provided in class. If you lost it, you can find the data and questions below.

• Note: this is the same data we used on our stamp problem yesterday, showing the average marriage age for American women based on the year.
• Again, YEAR should be the X variable and AVERAGE MARRIAGE AGE should by our Y variable.

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.