Answer
Interval.
Work Step by Step
Between years the difference is meaningful and can be ordered. Also there is no natural starting point at 0, therefore it is an interval.
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 - 1-3 Types of Data - Basic Skills and Concepts - Page 22: 23
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