A schoolteacher is concerned that her students watch more TV than the average American child. She reads that according to the American Academy of Pediatrics (AAP), the average American child in the population watches 4 hours of TV per day. She records the number of hours of TV each of her six students watches per day. The times (in hours) are 4.4, 2.5, 5.5, 2.8, 4.8, and 4.0.

(a) Test the hypothesis that her students watch more TV than the average American child in the population using a .05 level of significance. State the value of the test statistic and the decision to retain or reject the null hypothesis.

(b) Compute effect size using estimated Cohen's d.