IE 486 Work Analysis & Design II
Exam 2 Review
Dr. Vincent G. Duffy
Friday, March 23, 2007
IE486 – Material on Exam 2
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You’ll be asked to answer somewhere between 30 and 35 questions (M.C.
and short answer).
Lecture 15 Work Physiology (ch.12)
Lecture 14 Anthropometry & Workspace Design (finish) (ch.10)
Lecture 13 Biomechanics (ch.11)
Lecture 12 Exam Review & Anthropometry (start) (ch.10)
Lecture 11 Design Evaluation & Methods (ch.2, 3)
Lecture10 Structured questionnaires: more examples (Lab 3)
Lecture 9: Selection & Training (Ch.18)
Lecture 8: Human-Computer Interaction (Ch.15)
Began before exam 2 material, but due during exam 2 time period between
exam 1 & 2 – Lab 2
Emphasizing the notes and text materials that include parts of
– Ch. 2, 3 Design & Evaluation Methods, Ch. 10 Anthropometry & Workspace
Design, Ch.11 Biomechanics, Ch. 12 Work Physiology, Ch. 15 Human-Computer
Interaction, Ch. 18 Selection & Training
– Also includes issues in Lab 2 related to the IRB training module and Lab 3 on
Data Analysis & Interpretation.
– There will be no questions on the readings during exam 2.
• A mix of short answer and fill in; possibly some
quantitative; expect 6-8 sides of a page,
depending on size of figures; any necessary
equations would be given; Closed book, no
calculators.
• For multiple choice: circle the best answer.
• For all questions, be sure to read the question
carefully.
– If you are not clear on the meaning or how to interpret
the question, please ask.
Lecture 8 Human Computer Interaction
• Q. What is the purpose of a GOMS model?
– A. It is used to explain the users mental model
– B. It is used to predict performance.
– C. It is used for improved training and selection for
HCI related tasks.
– D. All of the above.
– E. None of the above
• Q. Give an example of a ‘selection rule’ in a
GOMS model.
Lecture 8 Human-Computer Interaction
• Q. Briefly explain what this below figure is showing.
• Q. If the total number of keystrokes is reduced, why might
productivity not be lowered in this specific application?
Lecture 9 Selection & Training
• L. Consider ways to quantify the benefits of ‘selection
tests’ or ‘transfer of training’ based on likelihood of
success (see notes, fig. 18.1 and p.486 in text).
Lecture 10-11 on Design Evaluation &
Methods
Q. A measure can be valid if it is not reliable.
a. True
b. False
Q. A factor analysis would be used before an
ANOVA when analyzing continuous data.
a. True
b. False
Briefly explain your answer_________________.
Lecture 10-11 on Design Evaluation &
Methods
Lecture on research methods
Q. Cronbach’s alpha is used as
a.
b.
c.
d.
e.
a measure of validity
a measure of reliability
in a chi squared analysis
all of the above
none of the above
Q. If q1 and q2 comprised a variable ‘feature’ with alpha
0.75, then the value for ‘score’ in the ANOVA would be
the mean of q1 and q2. True or False?
If you wrote False, briefly explain your
answer.__________________
Lecture 10-11 on Design Evaluation &
Methods
Lecture on Methods
The values shown below are after a factor analysis with rotation.
Which questions would you include in the measure for factor
1?
Factor 1
Factor 2
Ques. 1
Feel blue
- 0.898
0.047
Ques. 2
People stare at me
- 0.165
0.935
Ques. 3
People follow me
- 0.222
0.926
Ques. 4
Basically happy
0.905
- 0.279
Ques. 5
People want to hurt me - 0.549
0.544
Ques. 6
Enjoy going to parties 0.647
- 0.302
Lecture 10-11 on Design Evaluation &
Methods
Lecture on methods
The values shown below are after a factor analysis with rotation.
Which questions would you include in the measure for factor
1?
Factor 1
Factor 2
Ques. 1
Feel blue
- 0.898
0.047
Ques. 2
People stare at me
- 0.165
0.935
Ques. 3
People follow me
- 0.222
0.926
Ques. 4
Basically happy
0.905
- 0.279
Ques. 5
People want to hurt me - 0.549
0.544
Ques. 6
Enjoy going to parties 0.647
- 0.302
How much of the variance is explained by the first
factor? (show work)
Lab 2
• Q1. Why is it acceptable to proceed with IE 486 project II
data analysis without specific approval from Purdue’s
IRB for protection of human subjects in research?
Briefly explain.
• Q2. Under what conditions would project II efforts need
prior approval from Purdue’s IRB?
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if the work could be classified as research
if the work was intended for publication, thesis or dissertation
if any of the students intended to sell the results to a company
if the data were collected for discovering generalizable
knowledge
Lecture 10-11 on Statistical Analysis for
Lab 3
Q. The following is an example of SAS output from what
analysis?
Q. What is your interpretation of the results shown below?
2 Variables:
Variable
p1
p2
N
30
30
Mean
3.76667
3.76667
Variables
Raw
Standardized
p1
p2
Simple Statistics
Std Dev
Sum
1.92414 113.0
1.63335 113.0
Alpha
0.948786
0.955452
Min
1.00
1.00
Max
7.00
6.00
Lecture 12 Anthropometry
• Is it reasonable to expect that the ‘whole’
is equivalent to the ‘sum of the parts’? Yes
or No. Why?
Lecture 13 – Intro to Biomechanics
• Which is more costly, low back injury or
CTD/upper limb? When, or under what
conditions?
• Find the moment about the elbow for a single
segment biomechanical model of the forearm in
which the hand is holding a load of x kg.
• Show the individual coefficients to determine the
recommended weight limit for lifting in the given
example.
Lecture 14 Anthropometry
• Briefly describe the difference between design
for standing or seated work.
• What may be changed when accommodating for
differences in Precision work, Light work, and
heavy work?
Lecture 15 – Work Physiology
The figure 12.7 is based on an article from the journal
Ergonomics and shows work capacity as a function of
a. time
b. performance
c. heart rate
d. all of the above
e. none of the above