H ADM 201: Homework VIII
Due Friday, April 21, 2006, 2:00 pm
Name:_____________________________________________
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:
H ADM 201, Section 1. (Mondays 4:40 PM: Michelle Tong)
H ADM 201, Section 2. (Mondays 7:40 PM: Michelle Tong)
H ADM 201, Section 3. (Tuesdays 4:40 PM: Melanie Pope)
H ADM 201, Section 4. (Tuesdays 7:40 PM: Melanie Pope)
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H ADM 201
Homework VIII
Spring 2006
Question 1.
The following question is designed to give you a better understanding of how regression
works and how to use and interpret the regression output from Minitab. Imagine that you
want to predict the number of walkins each night based on the number of canceled
flights before 6:00PM at the local airport.
Observation
Number of Walkins
Number of Canceled Flights Before 6:00PM
1
3
18
2
5
22
3
8
26
4
14
31
Please
SHOW ALL
of your work clearly and by hand. It is perfectly appropriate to use
Minitab to check your answers. (STAT >REGRESSION > REGRESSION)
a.
Is this a regression problem or a correlation problem? Explain in two sentences or
less. If a regression problem, explicitly define the predictor variable and the
response variable.
b.
Compute and interpret
the slope of this linear regression, using the formula
∑
∑
=
=



=
4
1
2
4
1
1
)
(
)
)(
(
i
i
i
i
i
x
x
y
y
x
x
b
. (Or you may use the computational formula.)
c.
Compute and interpret
the intercept of the estimated regression equation using the
formula
x
b
y
b
o
1

=
. Is the interpretation of this parameter realistic given the
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 Spring '06
 RLLOYD
 Statistics, Statistical hypothesis testing, REGRESSION > REGRESSION

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