# discussion 3564

A student conducted a study of sleep habits at a large state university. His hypothesis is that undergraduates will party more and sleep less than graduate students. He surveyed random samples of 75 undergraduate students and 50 graduate students. Subjects reported the hours they sleep in a typical night.

For this hypothesis test, he defined the population means as follows:

• ${}_{}$

Î¼

1
is the mean number of hours undergraduate students sleep in a typical night.

• ${}_{}$

Î¼

2
is the mean number of hours graduate students sleep in a typical night

• Hours: typical number of hours a student sleeps each night
Program: undergraduate or graduate Program is the explanatory variable, and the data is categorical. Hours is the response variable, and the data is quantitative.