Answer
Convenience sample.
Work Step by Step
The person only used the 4500 responses she got back and therefore were the easiest to use. Therefore it is a convenience sample.
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 1 - Introduction to Statistics - 1-4 Collecting Sample Data - Basic Skills and Concepts - Page 32: 10
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