[meteor_slideshow slideshow=”arp1″]
Purpose: To study the relationship between two categorical variables for UF students and learn how to analyze Contingency Tables using Minitab.
1. Choose your Topic: Everyone should pick a topic that interests them – different topics for each student. You need to define your questions so that you have two categorical variables. One will be your explanatory variable that defines the groups you want to compare. The other one will be your response variable, which is the one you want to draw conclusions about.
Here are some examples, where I list the explanatory variable first.
Study the association between:
• Gender and Drinking Habits
• Smoking and Exercise Habits
• “Greek” Affiliation and Party Habits
• Race and Level of Satisfaction with UF
NOTE – You MUST define your OWN questions. The above are just some examples to get you started thinking of some ideas. In fact NO ONE should use any of those examples I listed above, or the same as their friends.
2. Collect the data: You should collect data from enough UF students and/or relatives so that all of the observed counts are 5 or more. Explain to the participants what the data will be used for. The data should be treated confidentially. If the subject is sensitive, you should prepare slips of paper with the two questions, ask the students to complete them without anyone watching, and place them in an envelope or box, where they will remain anonymous. You may collect data on yourself, you friends, classmates, or students that you don’t know. This is not a random sample, but it would be very difficult to get one. We will pretend that it is from a random sample.
4. Perform the statistical analysis:
Instructions for Minitab Version 14
a. Summarize the results of your data, by hand, in a Contingency Table.
b. Enter your counts on the worksheet of Minitab, using the necessary rows and columns. Label the columns (the row labels do not appear in the analysis, but the column labels do).
c. On the top menu, go to Stat –> Tables –> Chi-Square Test (Table in Worksheet).
d. Select whichever columns contain your data and then click OK.
e. The analysis appears on the Session window.
5. Prepare your report using a word processor. The report should be ONE page long, and include the following:
a. Your NAME and UFID number, and the course information.
b. The PURPOSE of your study – what are you trying to find out?
c. The statistical analysis performed by Minitab: With the left mouse button, select the analysis from the Session window, then use copy (Control-C) to copy the results from Minitab. Then go to your document and paste the results into your document using Control-V
d. All 6 steps of the statistical analysis should be included in your written report:
• Specify and check the assumptions. Are they satisfied?
• Added: Define the population(s), random variables and the parameter(s)
• Specify the hypotheses you are testing
• Specify the test statistic used and its calculated value.
• Specify the p-value (copy from the computer output)
• Write your decision
• Write your conclusion.
• Fit (a) to (d) on one page.
e. Put the output from Minitab on page 2 as an appendix.
[meteor_slideshow slideshow=”arp2″]
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