IE300
FINAL REVIEW QUESTIONS AND ANSWERS
MULTIPLE CHOICE QUESTIONS
1)
Consider the following box plot:
1
2
50
60
70
80
90
100
110
120
130
140
Smokes
Pulse2
Variable
Smokes
N
Mean
Median
StDev
Q1
Q3
Pulse2
1
28
81.18
15.39
70.50
93.50
2
64
76.00
17.88
68.00
84.00
Based on the above Minitab output what can be claimed for sure?
a)
The samples obtained from Smoke Type 1 and Smoke Type 2 are normally
distributed.
b)
Variance of the sample obtained from Smoke Type 1 is smaller than that of
Smoke Type 2.
c)
The sample distribution of Smoke Type 2 is left skewed.
d)
IQR of Smoke Type 1 is narrower than IQR of Smoke Type 2.
e)
The median of the sample obtained from Smoke Type 1 is smaller than the
median of the sample obtained from Smoke Type 2.
2)
An experimental design that permits statistical conclusions about two or more factors of main
interest is a
3)
In a laboratory experiment, data were gathered on the life span (Y in months) of 33 rats, units
of whether or not agent X
1
(a proposed life extending agent) was added to the rats diet (X
1
= 0
1

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if agent X
1
was not added, and X
1
= 1 if agent was added).
From the results of the
experiment, the following regression model was developed.
Y
= 38- 1.7X
1
From the regression equation, it can be said that the life expectancy of rats that were given
agent X
1
is
a)
1.7 months more than those who did not take agent X
1
b)
1.7 months less than those who did not take agent X
1
c)
34.3 months
d)
35.1 months
4)
Doubling the size of the sample will
5)
Which of the following(s) is true?
6)
When testing for a difference in two population means with unknown variances, a
pooled variance must be computed when
a.
Using a two-tailed test.
b.
Variances are assumed to be unequal.
c.
Variances are assumed to be equal.
d.
The sample sizes are equal.
e.
Means are assumed to be equal.

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