{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Exam 2-08 - Solutions

# Exam 2-08 - Solutions - Math 253 Exam#2 Spring 2008 Dr...

This preview shows pages 1–4. Sign up to view the full content.

Math 253 – Exam #2 Spring 2008 – Dr. Weaver 1. Given the following data set, calculate the correlation coefficient using the z-scores.  Show the  z-scores in the extra columns of the table, as well as the results of any other intermediate  calculations that you have the calculator do.  (The idea here is that you show that you know  how to do all the steps in the calculation so that you could do it with a very simple  calculator.)   LABEL EVERYTHING!!! x y z x z y z x  * z  z Σ x  *  z r 22 4 -0.12 -0.75 0.09154     17 3 -0.44 -0.84 0.37467     40 21 1.03 0.91 0.94606 7     5 1 -1.22 -1.04 1.26287 5     37 16 0.84 0.43 0.35868 6 9.34 0.934 19 8 -0.32 -0.36 0.11209     23 14 -0.06 0.23 - 0.01349     6 3 -1.15 -0.84 0.97118 3     7 3 -1.09 -0.84 0.91695 4     53 31 1.87 1.89 3.53704 7     34 24 0.65 1.21 0.78338 1     mean =  23.9 11.6 std dev  15.6 10.2

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2. The table shows oil production in the US at 5 year intervals. There are two different time periods with different trends and regression lines. Separate the data into those two time periods and find a regression line for each one. Use the calculator to find both regression lines and give the equations of both lines. Also list the residuals for the both periods in the table below.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 7

Exam 2-08 - Solutions - Math 253 Exam#2 Spring 2008 Dr...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online