To test whether the population means TV "on" time has declined in the past decade.

It has been reported that entertainment habits in America are changing and people today are watching less television than in the past (traditional defined as programming delivered via broadcast, cable including fiber optic, and satellite). In its place many people are surfing the Internet for diversion as well as playing video games and watching DVDs.

Let's say in 1998 at least one television was turned on in the average American home 9 hours and 40 minutes per day. Below right is given example data representing a random sample of households showing the number of minutes in a typical day at least one TV is turned on. Given this data use an appropriate statistical test to show whether the population mean TV "on" time has declined in the past decade.