Year of Experience
4
7
1
5
8
10
0
1
6
6
9
2
10
5
6
8
4
6
3
3
Score on PAT
78
100
86
82
86
84
75
80
83
91
88
73
75
81
74
87
79
94
70
89
Graduate Degree
NO
YES
NO
YES
YES
YES
NO
NO
NO
YES
YES
NO
YES
NO
NO
YES
NO
YES
NO
NO
Annual Salary ($1000s)
24
43
23.7
3

INFERENCE
SAMPLING DISTRIBUTIONS
Sampling Distributions
Estimate an unknown population parameter
e.g. population mean () or proportion ()
make inferences based on a sample statistic
e.g. sample mean () or proportion (p)
the sampling distribution of a samp

OPRE 506
Spring, 2015
H2
Paired t-test
M. Oblak
Due: Midnight Saturday April18
Required:
1. Post your Excel files to SAKAI (name files: lastname-h2).
2. This assignment is an individual assignment. The assignment is governed by the academic
integrity poli

OPRE 506
Spring, 2015
Excel Project 4: Simple Linear Regression
M. Oblak
Due: Midnight Saturday May 2
Required:
1. Post Excel file to SAKAI (please name file: your lastname-h4).
2. This assignment is an individual assignment. The assignment is governed by

OPRE 506
Spring, 2015
EXCEL Project 3
Chi-Square Test of Equality of Proportions
M. Oblak
Due: Midnight Sat Apr 25
This assignment is an individual assignment to be posted on SAKAI. The assignment is governed by
the academic integrity policy. Failure to a

OPRE 506 Spring 2015
M. Oblak
Grading Sheet Assignment 2
The assignment required the use of EXCEL to test the difference in mean mileage data under different
conditions (government standards vs real-life conditions using AAA drivers). Project assessment:

University of Baltimore
Merrick School of Business
OPRE 506.7B2
Spring, 2015
Data Analysis and Decisions
W 6:00 - 8:30
BC 219
Instructor:
Dr. Marilyn Oblak, Room BC 573,
E-Mail: Moblak@ubalt.edu
(410) 837-5260
Office Hours:
W 8:30 9:00 pm; and by appointm

INFERENCE
TESTS OF SIGNIFICANCE
TESTS OF SIGNIFICANCE
Assess evidence provided by data
against null hypothesis Ho
in favor of alternative hypothesis Ha
Hypotheses in terms of pop parameters
Ho: usually no change / no effect present
Ha: parameter differs f

Is the proportion of alcoholics the same for all four professions?
Number of Alcoholic/Non-Alcoholic
Alcoholic
32
51
67
83
233
Clergy
Educators
Executives
Retail
Total
UL
Clergy
Educators
Executives
Retail
Proportion of Alcoholic/Non-Alcoholic by Professi