SOM 650
BUSINESS DATA ANALYSIS
UNIVERSITY OF MASSACHUSETTS/AMHERST
Statement of Academic Honesty
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SCH-MGMT 650
Summer 2015
Statement of Academic Honesty
Please read and sign the following statement.
By my signature, I affirm that I have not received the assistance of anyone in the
completion of this examination, other than Professor Assaf. It is permi

Unit 1
1.16 What is the difference between a discrete variable and a continuous variable?
Answer:
While both are numerical variables, discrete variables are derived by counting process
but continuous variables are derived by measurement process.
1.28 A sa

Problem
1.3
1.4
1.5
1.8
1.21
1.27
1.28
1.43
Measurement of Scales
Answers
a. Download time is a continous numerical variable because the response value is within a continnum or interval and measured
b. Download time is Ratio scaled variable because the ti

Problems 9.2, 9.4, 9.5, 9.14, 9.16, 9.18, 9.19, 9.20, 9.24, 9.46, 9.58
Hypothesis Testing
9.2
Zstat
2.21
= 0.05
Above Zstat > 1.96, Reject Ho
=
9.4 Ho:=12.5
= 0.01
Reject Ho if test statistic is <-2.58 or >2.58
9.5 Reject Ho if test statistic is =-2.62
9.

Please consider below
Distribution A
5.1
X
0
1
2
3
4
a.
b.
c.
Means are 1 and 3 but variances are same i.e. 1.225
5.2
X
0
1
2
3
4
5
a.
b.
P(X=Y)
5.8
0.2
0.4
0.3
0.1
a.
E(X) =
x
y
b.
E(Y)=
x
y
c.
d.
x y
E(X+Y)
5.23 Multiple choices
n=
4 Balls
=
Probability