Does Early Language Reduce Tantrums? A recent headline reads "Early Language Skills Reduce Preschool Tantrums, Study Finds," and the article offers a potential explanation for this: "Verbalizing their frustrations may help little ones cope." The article refers to a study that recorded the language skill level and the number of tantrums of a sample of preschoolers.

(a) Is this an observational study or a randomized experiment?

(b) Can we conclude that "Early Language Skills Reduce Preschool Tantrums"? Why or why not?

(c) Give a potential confounding variable.