No, the researcher cannot conclude that being tall causes participants to eat more salads based solely on the observed correlation between the two variables. Correlation does not imply causation. There could be other factors influencing both height and salad consumption, such as lifestyle choices, health consciousness, or socioeconomic status.
To establish a causal relationship, the researcher would need to conduct controlled experiments or utilize statistical methods that account for potential confounding variables. Additionally, exploring the underlying reasons for the correlation through qualitative research could provide deeper insights.