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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

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:

ÃŽÂ¼

1

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

ÃŽÂ¼

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

Program

is the explanatory variable, and the data is categorical.

Hours

is the response variable, and the data is quantitative.

Data

sleep2

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

Upload Excel Data File to StatCrunch

(no screenshots; please use these directions)

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