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

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Basic Math

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

Hours ofSleep
AgeFewer than 66 to 6.97 to 7.98 or moreTotal
49 or younger30647670240
50 or older30588092260

Conduct a test of independence to determine whether the hours ofsleep on weeknights are independent of age. Use  = .05.Use Table 12.4.

Compute the value of the X2 (Chi2) test statistic (to 2decimals).????

b) Using the total sample of 500, estimate the percentage ofpeople who sleep less than 6, 6 to 6.9, 7 to 7.9, and 8 or morehours on weeknights (to 1 decimal).

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

Answer & Explanation Solved by verified expert
4.4 Ratings (885 Votes)
aFollowing table shows the row total and column totalHours ofSleepAgeFewer than 66 to 697 to 798 or moreTotal49 or younger3064767024050 or    See Answer
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