The National Sleep Foundation used a survey to determine whether hours of sleeping per night are independent of age (Newsweek, January 19, 2004). The following show the hours of sleep on weeknights for a sample of individuals age 49 and younger and for a sample of individuals age 50 and older.

Hours of Sleep
Age	Fewer than 6	6 to 6.9	7 to 7.9	8 or more	Total
49 or younger	36	60	72	72	240
50 or older	33	56	70	101	260

1. a. Conduct a test of independence to determine whether the hours of sleep on weeknights are independent of age. Use a= 0.05. Compute the value of the x²test statistic (to 2 decimals). Thepvalue is Item 2 What is your conclusion?
2. b. Using the total sample of 500, estimate the percentage of people who sleep less than 6, 6 to 6.9, 7 to 7.9, and 8 or more hours on weeknights (to 1 decimal).

   Less than 6 hours	%
   6 to 6.9 hours	%
   7 to 7.9 hours	%
   8 or more hours	%