Stage 3 of Semester Paper
Descriptive Statistics k
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Instructions for Stage 3 of the Semester Paper
Descriptive Statistics
1. Once again, go to the GSS web site and look under your chosen topic.

2. Choose an appropriate survey question to examine - one that you will continue to use for subsequent stages of the semester paper - for example: AGEKDBRN.

3. Click on the variable/survey-question to open a new window that contains the frequency distribution of the answers for this this question. Print this window (you will turn in the printout). Do the same thing for the survey question about the respondents' age (i.e., click on the variable "AGE").

4. Go back to the class web site. From the "DATA" Link on the left of the class site, download and save the 1998 GSS data set. This file is large (3 megs) so it will take several minutes to download if you are using a dial-up connection. You should save this data file on your computer or on a CD or other electronic media for use during the remainder of the semester. The file is named "1998sortreduce.sav" (your computer may show only "1998sortreduce").

5. Use SPSS software (on a University computer or after purchasing and installing a student version on your home computer) to do the following:
            a) print the frequencies of the responses given for the two survey questions. The question you chose above and the question about the respondent's age (the "AGE" variable).
            b) print the following descriptive statistics on the "AGE" variable: frequencies, mean, median, range, and standard deviation. You do not have to ask SPSS to calculate the mean, median, range, and standard deviation for the other variable (just the frequency table, which it does by default). 

6. Compare the frequencies in the output window for both questions/variables to those on the GSS web site - are they the same? Because I have already altered response codes like "don't know" and "not applicable," these should appear in the data set as "system-missing," which is indicated by a single dot. SPSS will automatically remove individuals with these system-missing values from your analyses.

7. Print the SPSS output that should contain the frequency distributions for both questions/variables and the univariate statistics for the respondents' age.

8. On this output, write a paragraph explaining what the mean, median, range, and standard deviation is for respondents' age. Explain how many individuals answered in each response category. Explain how many individuals did not answer this survey question.

To run the descriptive statistics in step 5, do the following:

1. Open SPSS

2. Open the 1998 GSS in SPSS - File menu -> Open -> Data     Find the location where you stored the data file.

3. From the Analyze menu -> Descriptive Statistics -> Frequencies ->   find your chosen variable, highlight it, click on the arrow in the center of the window to place the highlighted variable into the "Variables" box on the right of the window.

4. Click "OK" and leave the Output 1 screen open when it comes up.

5. Now follow step 3 again, but this time put the age question (AGE) in the box on the right. For this variable, click on the "Statistics" button. Choose "Std. Deviation," "Mean," "Median," and "Range." This tells the system to calculate the chosen univariate statistics for this variable. (Only do this for the age question/variable - skip this step for your chosen variable).

5. Click "Continue."

6. Click "OK." The new output from the AGE variable should appear right after the original output for your chosen variable.