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Quiz #3
NAME:_______________________________________________
MA 223, Engineering Statistics
Spring 2008; 10 points possible
CM Box #:_________________________
Chapter 3, Correlation and Simple Linear Regression
Due:
by Friday
, March 28
at the
BEGINNING of class
.
Answer each of the following.
1.
[2 pts]
For each of the following bivariate data situations, indicate what you would expect to be the
value of the Pearson sample correlation coefficient,
.
Be as specific as possible; for example, if the data set
consists of measurements of femur length (
x
) and heighth (
y
) for randomly selected Rose students, a good
answer would be “Positive and close to 1”.
(a) [0.5 pts]
The “Lucky Dogs” street vending company collects data monthly on the number of
Lucky Dogs sold (
x
)
and the gallons of mustard used (
y
) at each of their hot dog wagons.
(b)
[0.5 pts]
Donnie Dunker, a doughnut enthusiast and avid Chicago Bears fan, has for twenty
football seasons kept record of the Friday closing trading price of Dunkin’ Donuts stock (
x
) and the
number of points scored by the Bears (
y
).
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 Spring '08
 DeVasher
 Statistics, Correlation, Linear Regression

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