文档介绍：CHAPTER 1: A Preview of Business Statistics
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Introduction to Business Statistics
fourth edition, by Ronald M. Weiers
Presentation by Priscilla Chaffe-Stengel
Donald N. Stengel
© 2002 The Wadsworth Group
Chapter 1 - Key Terms
Collection, summarization, analysis, and reporting of numerical findings
Statistics - Two Usages
A. The study of statistics
B. Statistics as reported sample measures
1. Descriptive
2. Inferential
© 2002 The Wadsworth Group
Chapter 1 - Key Terms Inferential Statistics
Types of Variables
Qualitative Variables
Attributes, categories
Examples: male/female, registered to vote/not, ethnicity, eye color....
Quantitative Variables
Discrete - usually take on integer values but can take on fractions when variable allows - counts, how many
Continuous - can take on any value at any point along an interval - measurements, how much
© 2002 The Wadsworth Group
Example: Types of Variables Problem
For each of the following, indicate whether the appropriate variable would be qualitative or quantitative. If the variable is quantitative, indicate whether it would be discrete or continuous.
© 2002 The Wadsworth Group
Problem
a) Whether you own an RCA Colortrak television set
b) Your status as a full-time or a part-time student
c) Number of people who attended your school’s graduation last year
Qualitative Variable
two levels: yes/no
no measurement
Qualitative Variable
two levels: full/part
no measurement
Quantitative, Discrete Variable
a countable number
only whole numbers
© 2002 The Wadsworth Group
Problem , continued
d) The price of your most recent haircut
e) Sam’s travel time from his dorm to the Student Union
Quantitative, Discrete Variable
a countable number
only whole numbers
Quantitative, Continuous Variable
any number
time is measured
can take on any value greater than zero
© 2002 The Wadsworth Group
Problem , continued
f) The number of students on campus who belong to a social fraternity or sorority
Qua