A study of parental empathy for sensitivity cues and baby temperament (higher scores mean more empathy) was performed. Let x1 be a random variable representing parental empathy scores. Which of the following statements is true about the random variable x1?
1) x1 represents the sensitivity cues observed by parents
2) Higher scores of x1 indicate lower levels of parental empathy
3) x1 is a continuous random variable
4) The study found a positive correlation between x1 scores and baby temperament