- A random sample of 50 students at the University of Florida revealed the mean number of hours slept last night was 6 hours and 48 minutes (6.8 hours). The standard deviation of the sample was .9 hours. A previous study concluded that Americans get a mean of 7 hours of sleep per night. Is it reasonable to conclude that the students at the University of Florida sleep less than the typical American? Compute the p-value.
- According to a CBS News survey, 40% of Americans do not eat breakfast. A sample of 30 high school students found 16 had skipped breakfast that day. Use the .01 significance level to check whether high school students are more likely to skip breakfast.
- Refer to the Buena School District bus data provided on the author’s website. Is there a difference in the mean maintenance cost for the diesel versus the gasoline buses? Use the .05 significance level.
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