Chapter 1 Problem 1.2

A. The dollar amount on an accounts receivable invoice. B. The net profit for a company in 2009.
D. The national debt of the United States in 2009. These three A, B, and D are quantitive variables because they are considered numerical variables.

C. The stock exchange on which a company’s stock is traded.
E. The advertising medium (radio, television, or print) used to promote a product.
These two C and E are qualitative variables because they are catergorized.

Problem 1.17

Qualitative Variable Categories

Statistics Course Letter Grade A B C D F
Door Choice on Let’s Make a Deal Door #1 Door #2
Television Show Classifications TV-G TV-PG TV-14 TV-MA
Personal Computer Ownership Yes No
Restaurant Rating ***** **** *** ** *
Income Tax Filing Status Married Filing Jointly Married Filing Separately Single Head of Household Qualifying Widow(er)

Statistics Course Letter Grade has A, B, C, D, F as rankings so it would be ORDINAL.
Door Choice on Let’s Make a Deal are catergorized so it would be NOMINATIVE.
Television Show Classifications are also categorized and is NOMINATIVE.
Personal Computer Ownership is NOMINATIVE since it’s a category.
Restaurant Rating like Course Grades are rankings so it is ORDINAL.
Income Tax Filing Status puts you in categories to it is NOMINATIVE.

Chapter 3 Problem 3.3

1 3 5 5 7 8 8 8 8 8 8 9 9 9 9 9 10 10 10 10

Min: 1 Max: 10 Median: 8 + 8 = 16/2 = 8

First Quartile: Q1 = 7 + 8 = 15 = 7.5 2 2
Median of the Lower Half

Thrid Quartile: Q3 = 9 + 9 = 18 = 9 2 2
Median of the Upper Half

Five Number Summary: 1 – 7.5 – 8 – 9 – 10
Min – Q1 – Q2 – Q3 – Max

A. 9, 8, 10, 10, 12, 6, 11, 10, 12, 8
Mean: 9+8+10+10+12+6+11+10+12+8= 96/10 = 9.6
Median: 6, 8, 8, 9, 10, 10, 10,