Answer
It is a designed experiment.
Work Step by Step
The families are being randomly selected from the lists of all families that were on welfare.
Introductory Statistics 9th Edition
by Mann, Prem S.
Published by
Wiley
ISBN 10:
1-11905-571-7
ISBN 13:
978-1-11905-571-6
Chapter 1 - Section 1.6 - Design of Experiments - Exercises - Page 22: 1.34
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