Module 23 Homework 1 – Hypothesis Test for a Difference in Two Population Means (5 of 7)

Progress Check

Use this activity to assess whether you and your peers can:

• Under appropriate conditions, conduct a hypothesis test about a difference between two population means. State a conclusion in context.

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Directions

Use the drop-down menu to learn about the three steps needed to complete this assignment.

Three steps to complete the assignment

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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:

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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.

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Data

Download the datafile, and upload the file in StatCrunch.

• Open the sleep2 data set in the Stats at Cuyamaca College group on StatCrunch ( – opens in a new tab).

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Prompt

1. State the null and alternative hypotheses. Include a clear description of the populations and the variable.
   
2. Explain why we can safely use the two-sample T-test in this case.
3. Use StatCrunch to carry out the test. ()
   Copy the content in the StatCrunch output window (text and the table) and paste it into the textbox with your response.
   
4. State a conclusion in the context of this problem.

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List of StatCrunch Directions

Click here for StatCrunch Directions

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Module 23 Discussion Board

Use the Module 23 (opens in a new tab) to ask questions or provide feedback about the problems in any Module 23 activity – including this peer-reviewed assignment.

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Review Feedback

• Instructor feedback is only available after an assignment is graded.
• Use these (opens in a new tab) to learn how to review feedback.

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Rubric

Formative Assessments w/ StatCrunch

Formative Assessments w/ StatCrunch

Criteria	Ratings	Pts
This criterion is linked to a Learning OutcomeAnswering the Prompt	8 ptsFull CreditThe first submission demonstrates a good-faith effort to address each part of the Prompt. Either in the first draft or the optional final draft, all parts of the “Prompt” are addressed and the responses demonstrate attainment of the learning objectives in the “Progress Check” section of the assignment. The answers are correct. The writing/work is clear. The explanation/work is reasonable, well-organized, and easy to follow. 6.5 ptsMostly CorrectThe first submission demonstrates a good-faith effort to address most of the Prompt. In the optional final draft all parts of the “Prompt” are addressed, and the responses demonstrate attainment of the learning objectives in the “Progress Check” section of the assignment. The answers are mostly correct. The writing/work is clear. The explanation/work is reasonable, well-organized, and easy to follow. 3.5 ptsOne or more incorrectThe first submission demonstrates a good-faith effort to respond to a smaller portion of the Prompt. In the first draft or the optional final draft, one or more parts of the “Prompt” are not addressed or are incorrect. Or, answers do not demonstrate attainment of the learning objectives in the “Progress Check” section of the assignment. Or, answers are correct, but the writing/work is unclear, incorrect, or difficult to follow. 0 ptsNo MarksThe first submission does not demonstrate a good-faith effort to address the Prompt.	8 pts
This criterion is linked to a Learning OutcomeStatCrunch	2 ptsFull CreditStatCrunch graphs and/or tables are correct and embedded with your work. 1 ptsPartial CreditStatCrunch graphs and/or tables are incorrect or missing important information. 0 ptsNo CreditNo StatCrunch information is embedded with your post. Or all StatCrunch work is incorrect.	2 pts

Total Points: 10

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