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Evaluation der Wirksamkeit von Werbung auf die Beliebtheit von Spielzeug bei Kindern (Robertson & Rossiter, 1976)- AV: Beliebtheit von beworbenem Spielzeug in der Weihnachtszeit; nicht-äquivalente AV: Beliebtheit von nicht beworbenem Spielzeug in der Weihnachtszeit- Damit kontrollierte Bedrohungen: Zwischenzeitliches Geschehen (z.B. „Geschenkezeit" Nov. / Dez.) → sollte nicht nur Effekte auf beworbenes Spielzeug haben- (Zeiteffekt der Weihnachtszeit rausnehmenHat wirklich Werbung Einfluss ungeachtet oder ist es nur Weihnachtszeit)
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