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

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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.