Cupcake University recently switched to a new brand of COVID…

Cupcake University recently switched to a new brand of COVID test, which—like all COVID tests—claims to measure whether or not a person has COVID. Unfortunately, the test has a high rate of false positives. As many as 50% of students who test positive do not actually have COVID. Based on this information, there appears to be a problem with the test’s…

Claudia reads a research study where the authors reported th…

Claudia reads a research study where the authors reported that, in the United States, first-generation immigrant children tend to perform better in school than native-born children. She thinks to herself, “This can’t be right. I’m a first-generation immigrant and I did terrible in school!” Based on this information, Claudia may need to be reminded that… 

In a 2016 study by Fancourt, Burton, and Williamson, men and…

In a 2016 study by Fancourt, Burton, and Williamson, men and women played the game “Operation” while listening to different types of music. Males performed worse when listening to AC/DC than when listening to Mozart, but female participants’ performance at playing the game did not differ based on music. Based on this information, how many variables were in the study?