In a study to determine if her students watch more TV than the average American child, a schoolteacher records the daily TV viewing hours of her students. obtaining times of

4.4,2.5, 5.5, 2.8, 4.8 and 4.0

hours. According to the American Academy of Pediatrics

(AAP), the average is 4 hours. The teacher calculates an observed t-value of 2.1. Given this scenario and a significance level of 0.05, formulate the null and alternative hypotheses, decide whether to retain or reject the null hypothesis based on the t-value, and explain the implications of your decision regarding the teacher's concern about her students' TV watching habits.