Which of the following is an example of a one-way ANOVA test?

• a.)
• Comparing the number of hours of sleep between children and teenagers.
• b.)
• Studying the number of hours slept as well as the average GPAs for middle school, high school, and college students.
• c.)
• Studying the number of hours of sleep for teenagers, adults, and senior citizens.
• d.)
• Comparing the monthly incomes of residents who live in urban and suburban areas.