Lab 3



ALL lab directions assume you have gone to and signed in.

IMPORTANT: To be successful in completing your labs you must read the entire lab through at least once. You should always get your computer output verified if you have any doubt about it being correct. If you have the wrong output you simply can’t answer the lab questions at the end.

YOU MUST PRINT GRAPHS IN COLOR. NO black and white graphs will be accepted.

All labs the ENTIRE semester will have: a cover sheet, computer output, typed discussion questions with answers, IN THAT ORDER.

Lab 1

Graphing Quantitative Data with Histograms

The purpose of this lab is to teach you how to make frequency and relative frequency histograms using StatCrunch.

Part I. Use the dataset, “Responses to Physical Fitness Survey” to construct and compare relative frequency histograms for the number of hours per week of exercise. One graph will be made for women, one for men, and one for both men and women with different color codes on the same graph.

Step 1: Open the dataset “Responses to Physical Fitness Survey” from the class group data and read the description of the variables.

Step 2: Select Graphics > Histogram. Select the Column “Hours” and Group by: “Gender”. Check the box for “Separate graph for each group”. Click Next and choose Type: “Relative Frequency”. Check the box for “Display values above bars if possible”.

Click Next twice and give appropriate X axis and Y axis labels for your graph. For now, leave title as “--optional--“. Check the boxes next to “Use same Y axis” and “Use same X axis”. Click Next and change “Columns per page” to 2. Click on “Create Graph!”

Step 3:

Export your results and copy/paste into a Word document in order to give it a great title:

Click on “Options > Export to My Results (Save/Copy/Print)”. Type a title for your own reference (this will not appear on your graph, only in your Results) and click “Export”. Click on your exported graph on the left side of the screen, under “My results for this data”. Click “Copy” and then paste your graph into a Word document. In the Word document, type a great title above your graph. Print in color.

Step 4: Repeat Step 2 and uncheck the box for “Separate graph for each group”. You can give this graph a great title within StatCrunch. Export your graph and print in color.

Part II. Use the dataset, “Old Faithful” to construct a frequency histogram for the duration of the eruptions.

Step 1: Open the dataset “Old Faithful” from the class group data and read the description of the variables.

Step 2: Select Graphics > Histogram. Select the Column “Duration” and click Next. Choose Type: “Frequency”, check the box for “Display values above bars if possible” and click Next twice.

Give appropriate X axis and Y axis labels for your graph, and a great title. Click “Create Graph!” Export and print.

Discussion Questions:

1. For the “Physical Fitness” data, compare and contrast the two groups (men and women). Write 3-4 concise, descriptive sentences as demonstrated in class.

2. With the “Physical Fitness” data, is it preferable to use relative frequency histograms or frequency histograms to compare these two groups or does it not matter? Explain.

3. For the “Old Faithful” data, describe the distribution and any interesting features. Write 3-4 concise, descriptive sentences.

A complete lab will have in this order:

← A cover sheet with your name, class meeting time, professor’s name and lab number in the upper right hand corner. All labs for the entire semester must have a cover sheet just like this.

← Computer output consisting of 4 histograms.

← Typed discussion questions along with the answers. For this and all future labs use a word processor to copy the entire discussion question and give your answer in complete, grammatically correct sentences. The format should be

Question 1: (copied and pasted directly from the lab document)

Answer 1: (grammar and spelling count use a grammar/spell check program and proof read!)

Be as clear and concise as possible. Most questions in all labs all semester can be answered in 1 to 4 well written sentences at most. Always refer to your class notes on the lab demonstration to see a well formatted answer.

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