Learn by Doing
In this activity you will learn to use StatCrunch to perform a two-sample t-test.
Some features of this activity may not work well on a cell phone or tablet. We highly recommend that you complete this activity on a computer.
Here are the directions and grading rubric for the
Learn by Doing
discussion board exercises.
A list of StatCrunch directions is provided at the bottom of this page.
Context
Do undergraduates sleep less than graduate students?
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:
μ
1
is the mean number of hours undergraduate students sleep in a typical night.
μ
2
is the mean number of hours graduate students sleep in a typical night.
Variables
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.
Data
Download the
sleep2
(Links to an external site.)
datafile, and upload the file in StatCrunch.
Prompt
State the null and alternative hypotheses. Include a clear description of the populations and the variable.
Explain why we can safely use the two-sample T-test in this case.
Use StatCrunch to carry out the test. (
directions
)
Copy and paste the content of in the StatCrunch output window (text and the table) in your initial post.
State a conclusion in the context of this problem.
List of StatCrunch Directions
Each link will open in a new window. To return to this discussion, either close the new tab or select the tab for this discussion.
Create Your
Stats-Class
Folder in Canvas
(You only need to do this once.)
Purchase StatCrunch
(You only need to do this once.)
Open StatCrunch
Download Excel Data File
Upload Excel Data File to StatCrunch
Download StatCrunch Output Window
(no screenshots; please use these directions)
Upload Files into Your
Stat-Class
Folder in Canvas
Embed Pictures in a Discussion Post
(no attachments; please use these directions)
Copy & Paste a StatCrunch Table
Conduct a Hypothesis Test for the Difference of Two Population Means
Content by the
Open Learning Initiative
(Links to an external site.)
and licensed under
CC BY
(Links to an external site.)
.
