## Correlation

**Due Thu, Feb 6**

Textbook Reading

- Ch 12, p 471-474 (Correlation)

Suggested (optional) video resources

Category: Teaching

**Due Thu, Feb 6**

Textbook Reading

- Ch 12, p 471-474 (Correlation)

Suggested (optional) video resources

Here are the results for Exam 2 along with the Exam 1 redo scores.

Scatter Plot (Exam 2 only):

4 0

5 255

6 0388

7 133889

8 0259

9 00003345678

10 0

COURSE_ID | Exam 1 final | Exam 2 |

1102957 | 0 | 0 |

2515248 | 71 | 0 |

2696636 | 100 | 93 |

2797662 | 95.5 | 98 |

3054380 | 86 | 80 |

3432979 | 100 | 90 |

3577277 | 93 | 55 |

3600679 | 80 | 52 |

3859980 | 90 | 68 |

4061885 | 87.5 | 79 |

4119181 | 100 | 93 |

4438666 | 88 | 73 |

4485284 | 98 | 95 |

4648386 | 92 | 78 |

5080187 | 100 | 96 |

5086679 | 82.5 | 40 |

5461690 | 86 | 63 |

5787054 | 74 | 71 |

5830100 | 70 | 68 |

5844257 | 92 | 97 |

5853143 | 86 | 78 |

6535526 | 94 | 100 |

6758117 | 100 | 85 |

6800100 | 100 | 90 |

6805587 | 76 | 73 |

7073182 | 83 | 60 |

7106642 | 88 | 55 |

8487393 | 87.5 | 89 |

8775107 | 87 | 82 |

9369496 | 90 | 90 |

9708223 | 97 | 94 |

9823737 | 88 | 90 |

Hopefully I did this correctly this time. Please let me know if you have questions or concerns about these scores.

**Exam #2** will be administered in class on **Thu, Jan 30** and will cover all review materials that have been assigned to date up through and including Assignment #5.

Here are a few of the top posts for Assignment #4.

- http://aaaguilar93.wordpress.com/2014/01/28/assignment-4/
- http://ksquan.files.wordpress.com/2014/01/doc-jan-27-2014-3_14-pm.pdf
- http://kevincuff.wordpress.com/2014/01/28/assignment-4/
- http://jcvoss.wordpress.com/2014/01/28/assignment-4/

Great job authors!

**Due Thu, Jan 30**

Complete the following problems from the textbook and post results to your blog (just like Assignment #4).

- Problems
**8.2**and**8.4**on p 264 - Problem
**8.14**on p 271 - Problems
**9.2**and**9.6**on p 313 - Problems
**9.11**and**9.12**on p 319

Picture or scan of hand-written work seems to work well. Please write clearly and adjust the image so that it’s properly rotated (not sideways) for easier grading.

**Due Thu, Jan 30**

Textbook Reading

- Ch 8, p 259-262, 266-270 (Estimating the Population Mean)
- Ch 9, p 296-300, 303-305, 305-312, 314-318 (Hypothesis Testing)

Textbook Companion Videos

- Confidence Intervals
- Determining Which Inferential Technique to Use, Part I: Confidence Intervals
- Establishing Hypotheses
- Determining Which Inferential Technique to Use, Part II: Hypothesis Tests
- Two-Tailed Tests
- Type I and Type II Errors
- Hypothesis Testing Using the z Statistic
- Understanding p-Values

Suggested (optional) Video Resources

**Due Tue, Jan 28**

Complete the following problems from the textbook and post results to your blog.

- Problem 6.6 on page 200
- Problems 7.13 and 7.14 on page 243

You will almost certainly need to work these out by hand. You can then scan to PDF or take a picture and post the image to your blog. If you are able to find a more clever way to get it done, go for it!

Check these links to some of the best blog posts for Assignment #2. We will look at a few of these in class today, time permitting.

- http://jcvoss.wordpress.com/2014/01/21/assignment-2/
- http://kyleleuer.wordpress.com/
- http://lukeclementi.wordpress.com/2014/01/21/12/
- http://ktmaglia.wordpress.com/
- http://wtvaupel.wordpress.com/

Nice job authors!

I would encourage the use of fellow student blogs as learning resources. Post comments, questions and reply to questions! Part of the idea is to create a learning community and share ideas.

I’ve selected a set of sample answers from student exams and posted the images below. We will review in class today.

I’ve graded Exam #1. Here is a summary. I will post individual scores once I’ve assigned a random course ID to each student.

Exam 1 Descriptives | |

Mean | 87.03 |

Median | 87.50 |

Mode | 100.00 |

Std Deviation | 10.97 |

Range | 48.00 |

Minimum | 52.00 |

Maximum | 100.00 |

Count | 30.00 |

Here’s a Stem & Leaf illustration of the distribution of all scores.

5 2

6

7 147899

8 46667889

9 2344789

10 00000

Here are the individual scores using your newly created Course ID to protect privacy. [Note: I made minor adjustments to 3 exams (all +1 or +2 points) so the summary above is no longer perfectly accurate.]

COURSE_ID | Exam 1 |

1102957 | 0 |

2515248 | 71 |

2696636 | 100 |

2797662 | 94 |

2821542 | 0 |

3054380 | 86 |

3432979 | 100 |

3577277 | 93 |

3600679 | 80 |

3859980 | 80 |

4061885 | 80 |

4119181 | 100 |

4438666 | 88 |

4485284 | 98 |

4648386 | 89 |

5080187 | 100 |

5086679 | 77 |

5461690 | 86 |

5787054 | 74 |

5830100 | 0 |

5844257 | 92 |

5853143 | 86 |

6535526 | 94 |

6758117 | 100 |

6800100 | 100 |

6805587 | 52 |

7073182 | 79 |

7106642 | 84 |

8487393 | 80 |

8775107 | 79 |

9369496 | 88 |

9708223 | 97 |

9823737 | 88 |

After reviewing your exam let me know if you have any questions or concerns with grading. Grading is difficult and I sometimes miss something; please bring it to my attention so that I might correct any mistakes.