3. Suppose a group of researchers hypothesized that finding your romantic partner to be highly physically attractive predicts high degrees of satisfaction in your relationship. To evaluate this hypothesis, the researchers asked 100 participants to complete a survey that included questions about their current relationship satisfaction as well as ratings of how physically attractive they believed their partner to be. The researchers found that the more physically attractive participants rated their partners, the more satisfied they tended to be in their relationship. In this fictitious study, did the researchers employ a correlational or an experimental design? How do you know?