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Stat 200 Exam 1 Fall Semester 07 (Sections 912) Form A
(37 questions/each worth 3 points  so points of extra credit as possible)
Name:
__________________________
Student Number (last four digits):____________
•
Fillin both: your complete 9 digit Student Number & Test Form
on your scantron
•
Put both
your name and student number (last 4 digits) on the exam
•
Handin both exam and Scranton.
Show ID
•
Must have a different colored exam than the person on either side of you.
•
You may not
use you a textbook, notes, and calculator, etc. while taking this exam
Use with Questions 12:
Suppose researchers want to determine whether or not taking fish oils
decreases the risk of having dementia.
Question 1
: The variable:
whether or not the person has dementia
, is which of the following?
A(n)____
A.
categorical
variable
B.
explanatory variable
C.
response variable
D.
E.
both A & C are true
Question 2
: Based on how the study could
best
be designed, if they did indeed find a lower rate
for dementia for those who take fish oils, could they conclude that the relationship is “causal”?
A. Yes
B.
No

Question 3:
Which of following is an
untrue
statement about the standard deviation?
The
standard deviation ____
A.
is an example of a resistant statistic
B.
roughly represents the average distance of the observed values from the mean
C.
has an interpretation that is linked to the empirical rule
D.
is an accurate measure of spread when the data is normal in shape
Question 4:
When considering 2X2 tables, which of the following is
not
a factor that contributes
to the results being statistically significant.
A.
a large sample size
B.
a large difference in the two row percents (individual risks)
C.
large values for the two row percents (individual risks)
Question 5:
Which of the following variables
not
is a binomial?
For a random sample of 200
PSU students:
A.
the number who have tickets for the Wisconsin game
B.
the number who prefer to pay with “plastic” when making purchases
C.
the number of visits to Pattee Library during a semester
D.
the number who own an iPod
Question 6:
For a large sample of IQ scores the mean is 100 and the standard deviation is 10.
Assuming the data forms a normal curve, which of the following intervals best represents the
minimum to the maximum IQ score for this sample?
A. 90 to 110
B. 80 to 120
C.
70 to 130
D.
0 to 200
Question 7:
Which of the following statements is
untrue
?
A statistic ________
A.
is also called a sample estimate
B.
does vary in value from sample to sample
C.
has a sampling distribution
D.
is a numerical summary (descriptive) of a population
1
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View Full DocumentUse with Questions 813.
A regression equation that describes the relationship between
time
spent writing a paper (x) in hours and
length
of paper (y) in pages is found below.
time
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 Fall '08
 BARROSO,JOAOR
 Statistics

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