Can your diet make you happier? A researcher wants to know if the food you eat has an effect on your happiness. A random sample of 41 adult participants completed a survey on happiness and a questionnaire on their diet (vegetarian, vegan, low carb, low fat, or no diet). The happiness survey is scored on a scale of 50–100, where higher scores are associated with a higher degree of happiness and satisfaction in the participants’ life. Would you describe this as an experimental or an observational study? Describe the population that you believe the researcher can generalize to?