# Mathematics Tutors

 Subject Mathematics Due By (Pacific Time) 11/28/2016 01:00 pm

#### Frequencies

Frequency distributions tell us the number and percentage of the attributes of a variable. For example, for the variable Race, it might tell us the number and percentage of White, African American, and other groups. To run a frequency distribution using data from a dataset:

1. Open Sofastats and then click on Enter/Edit Data.  Make sure the demo_tbl is there, then click Close.
2. Click on Report Tables
3. Check "Frequencies"
4. Add "Age Group" and "Gender"
5. Click on "Column Config", then check "Frequency" and "Column %", then click on Okay
6. The results can be seen in the lower left of the screen
7. Check "Also add to report" and give the report a unique name, e.g., Freqs
8. Click on "View Report"
9. This will show you the table.
10. cut and paste your results in a Word doc..

#### Crosstabulations

Crosstabulations are two (or more) frequency distributions combined. They tell us the differences in the distributions of two (or more) variables and whether the differences we see are statistically significant by performing a chi-square test. We will again be using the same dataset. To conduct the crosstab:

1. Open Sofastats and then click on Enter/Edit Data.  Make sure the demo_tbl is there, then click Close.
2. Click on Report Tables
3. Check Crosstabs
4. Add Age Group for rows
6. Click on Column Config, then check "Misc Totla", "frequency", and "Column %", then click on Okay
7. The results can be seen in the lower left of the screen
8. Check "Also add to report" and give the report a unique name, e.g., Xtab
9. Click on "View Report", then close
10. Now click on Statistics
11. Click on "Chi-Square" > Configure test
12. For Group A: choose "Age Group"
13. For Group B: choose "Country"
14. Click on "Also add to report", then "Show Results"
15. You can now see the p-value and other results
16. Now click "View Report" and copy and paste into a Word doc
17. You will now see a crosstabulation that tells you differences in age groups by country.

#### Deliverables

1. Include your frequency tables and briefly describe what they tell you. When you report your results, please do so by presenting numbers and frequencies, for example, there were _number of male respondents, representing _% of the sample, etc.
2. Include your crosstab and tell me: The major differences in percentage of each age group by country.
3. Are the differences in age groups by country statistically significant? What is the p-value?

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