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STAT 201: Tips on EWA for Lab Session 9

The text of the EWA must be typed. Some neat, hand-written labels and/or numbers on figures are permitted.

Before you Leave lab 9 :

à Make sure you have access to your StatCrunch.com output (dot plots, descriptive statistics, results for the confidence interval and hypothesis test). Save your results in StatCrunch or create a word document with you results and email them to yourself (your lab instructor can help).

Overview of Paper Sections:

Abstract:

For this lab be sure to include the following in the abstract:

à The purpose of the experiment

à A brief description of the data collection and analysis (exclude fine details which will be covered in your paper)

à Your conclusion: What is the average heart rate increase after climbing a flight of stairs? Do students reach a heart rate above 119 after climbing a flight of stairs, on average.

à Major results that support those conclusions: the results of your hypothesis test (in language that anyone could understand) and a good interpretation of your confidence interval for the mean.

Materials and Methods: For this lab , be sure to include:

à Description of experiment’s purpose

à Description of sample selection (Was it a random selection?)

à State the materials and software (StatCrunch.com) that were used.

à Description of basic experiment. Describe how the measurement was taken. Give the reader enough details so that they could repeat the measurement process if necessary.

à Description of statistical methods. Suggestion: Make an ordered outline of the major steps in the analysis from the lab handout. Then, turn the outline into paragraphs describing the experiment. Methods used include: Descriptive statsitics, dotplots, (one-sample t) confidence interval for the mean, (one-sample t) hypothesis test for the mean. Elaborate on each method – do not just list them! Describe not only what statistics were calculated but why they were calculated as well. Do NOT give any numbers here, just describe the analysis techniques that were performed. Do NOT give explicit instructions on using StatCrunch. Assume your reader knows how to use the software program. Someone who knows nothing of the experiment should be able to repeat the entire analysis from your description.

Results:

The Results section for this lab should include:

à A roadmap PARAGRAPH (not a list) is required to describe the tables and figures in the results section. This should appear at the beginning of the Results section. The roadmap paragraph consists of approximately one sentence per table explaining to the reader what information is contained in the following tables. Do NOT tell why the table is important – you have already covered this in the materials and methods section when you explained why the analyses were performed.

à Data from Table 9.3. Do NOT turn in the pages from your lab handout! Also create two additional tables that give the results from the confidence interval for the mean, and the hypothesis test for the mean. Do NOT interpret any of these results – that will be done the the discussion section. You do not need to include the raw data (Table 9.2).

à Your two dotplots should be included as Figure 1 and Figure 2.

à All of your tables are figures should be numbered (Table 1, Table 2, etc.) and labeled.

Discussion:

The Discussion section for this lab should include:

à Description of the purpose of the experiment.

à General comments on the descriptive statstics. How does the mean compare to the median? What does this mean? What does the standard deviation tell you in the context or this experiment?

à Make general comments on the shape of the dotplot. Is there extreme skew or extreme outliers? Are you concerned about the assumption that the population distribution is normal?

à Discuss the results from the confidence interval and hypothesis test for the mean. Give a good interpretation of the confidence interval that a general reader could understand. Also, interpret the reults of the hypothesis test.

à Discuss any shortcomings of the experiment.

à Ideas for further experimentation: what could be done to change the experiment? How could you improve upon this experiment? Or, what other types of experiments might be valuable to the college health club?