Statistics Lab Manual Fall 2014

Lab exercises for PSY 275

Fall 2014

Glenn Geher (course Instructor; Lisa Schimski, LAB instructor)

Laboratory Exercises for Statistics (Psyc 80275); Spring 2013

 Specific HW assignments are determined by Lisa and are all included in the textbook

Glenn Geher


Office: 314A

Phone: 257-3091


Lisa Schmiski


Office: HUM 4

Office Hours: TBD


Please note that all homework and lab assignments are due to your TA at the start of the following week’s laboratory session.

Late Assignment Policy:  All homework and lab assignments will be due at the beginning of lab on the week after the assignments are given out. None of these assignments will be accepted late. Any assignments not handed in on time will be assigned grades of 0.

Accommodation Policy: There may be conditions under which your TA modifies the schedule below to optimally accommodate teaching of the material.

Week of: Laboratory Exercise Outline and Assignment Summary
8/25 Welcome to Lab.
9/1 Basic Issues in Statistics(Chap. 1)
9/8 Mean, Median, Mode, Standard Deviation (Chap.
Computer Lab 1 (Descriptive Statistics)
9/15 Z scores (Chap. 3) 
9/22 Review



9/29 Computer Lab 2 (Correlation)
Chapter 5 – Regression
10/6 REVIEW andHypothesis Testing Basics (Chap. 6)
10/13 Fall Break – partaaaay! (and bring notebook!)
10/20 Chapter 7 – Conceptual issues
10/27 Hypothesis testing – N = 1 (Chap. 7) 
11/3 Hypothesis testing – N > 1 (Chap. 8)
11/10 Power and Effect Size (Chap. 9) 
11/17 One Sample and Repeated Measures t-test (Chap. 10)Computer Lab 3 (t-test lab) 
11/24 Independent-means t-test (Chap. 11) Computer Lab 4 (ANOVA) 
12/1 ANOVA (Chapter 13) *** if you do not meet with lab instructor this week, you will work with her to make arrangements to hand these in prior to a specified time.
 12/8  Review



1. Note that some weeks, a particular lab section may meet on a day that would make it more useful for  students to review for an exam than to go over new material. We will all work together to accommodate such situations in a way that optimizes your ability to master the material in an overall sense.

2. If your lab does not meet on a particular week due to the academic calendar, you still need to complete the assigned homework assignments and hand them in the subsequent week. In such instances, you may attend a different lab section, see the TA or Professor for help, or simply base your work on your reading and on notes from class.

Writing Tips

 No papers with an abundance of the following errors will receive a grade of ‘A.’

1.  USUALLY affect is a verb and effect is a noun;

e.g., This variable affects several things.

e.g., That other variable produced a very large effect.

2.  If the subject of your sentence is singular, the verb and subsequent pronouns referring to the subject must be also:

e.g., The participant then provided HIS OR HER (NOT “THEIR”) background


e.g.,  The point of these studies WAS (NOT “WERE”) blah, blah, blah … (point is singular).

3.  NEVER use the word “PROVE” in a psychology article.  While psychologists do many things, proving is virtually never one of them.

INCORRECT: These results prove that Schmedley’s hypothesis was correct.

BETTER: These results support Schmedley’s hypothesis.

BETTER STILL: These results support the hypothesis that Schmedley should change his name … just kidding.

4.  BE SUCCINCT.  Do not use a lot of words to make a point if you can make the same point with fewer words.  If two papers make the same points, the one with fewer words is, by my definition, better.

BAD:  Asch’s research on conformity is very interesting because it includes interesting research and has important ideas that are very meaningful.

BETTER: Asch’s research on conformity is interesting for several reasons.

5.  AVOID 1st person and, especially, opinions (unless they are asked for).

BAD: I am writing a paper on conformity.  In this paper, I will talk about how social psychologists have studied conformity and why I am so interested in this interesting topic.

BETTER: This paper will address conformity as it has been studied in social psychology.


BAD: Subjects were asked if they’d administer an electric shock.

BETTER:  Subjects were asked if they would administer an electric shock.

7.         It’s means it is (but you should not be using contractions anyway).

             Its is a possessive pronoun referring to a noun that possesses something.

e.g., The frog grabbed the fly with its tongue.   (here its means the frog’s)

8.  Punctuation marks go INSIDE quotation marks (when at the end of the sentence).

BAD:  Then the experimenter said, “Oh Boy”.

BETTER:  Then the experimenter said, “Oh Boy.”

BETTER STILL:  Then the experimenter said, “Golly!”

9.  Always follow the word “this” with a specific noun.  Otherwise, your writing will be unclear.

BAD: Changes will be made at all levels of management.  The impact of this will be enormous.

BETTER: Changes will be made at all levels of management.  The impact of this restructuring will be enormous.

10.  i.e., means “in other words.”  e.g., means “for example.”

e.g., These people are thought to be cerebral in nature (i.e., they tend to think a lot).

e.g., Their diet includes several kinds of flowers (e.g., roses).

11.  Here are some helpful word substitutions for you:

Change from                                    to

looked at                                examined

got                                           obtained

did                                           conducted

12.  Only use the word “correlation” if you are referring to a specific relationship between two different variables.  Do not just throw this word around because it sounds good.

GOOD: A positive correlation was observed between number of hamburgers eaten and the size of one’s bellyache.

BAD: A correlation between these different ideas can be found.  (This sentence simply does not mean anything).