Question

In: Statistics and Probability

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.
Hours of Sleep
Age Fewer than 6 6 to 6.9 7 to 7.9 8 or more Total
49 or younger 38 65 70 67 240
50 or older 34 59 73 94 260
  1. Conduct a test of independence to determine whether the hours of sleep on weeknights are independent of age. Use = .05. Use Table 12.4.

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


    The p value is Selectless than .005between .005 and .01between .01 and .025between .025 and .05between .05 and .10greater than .10

    What is your conclusion?
    SelectConclude age and hours of sleep are not independentCannot reject the assumption that age and hours of sleep are independent
  2. 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 %

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Expert Solution

orchestra answered 1 year ago
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