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The National Sleep Foundation used a survey to determine whether hours of sleeping per night are...

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.

Age Hours of sleep- fewer than 6 6 to 6.9 7 to 7.9 8 or more Total
49 or younger 34 62 72 72 240
50 or older 37 62 73 88 260

Conduct a test of independence to determine whether the hours of sleep on weeknights are independent of age. Use a= .05.

Compute the value of the x2 test statistic (to 2 decimals).
Find the p-value

What is your conclusion?
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:

6 to 6.9

7 to 7.9

8 or more

Math   Statistics-And-Probability   
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