2) Categorical Variable: When a variable names categories and answers questions about how cases fall into those categories.
Quantitative Variable: When a measured variable with units answers questions about the quantity of what is measured.
Case: an individual who we collect data on.
Sample: a selected portion that is used to show what the whole portion is like.
Population: the whole array of cases we wish we knew about.
An example of a categorical variable would be a survey about which frozen yogurt you prefer the most. The case would be the specific frozen yogurt you chose. The sample would be the data specifically on the frozen yogurt you chose. The population would be all the frozen yogurts you surveyed from.
An example of a quantitative variable would be the average weight in the United States for all ages. A case would be a person in specific, in example a close friend. A sample would be only the average weight of females ages 12-16. The population could be the average weight in the entire U.S.
3)
| Total tuition, room and board rates charged for full-time undergraduate students in degree-granting institutions for 1 year of college. | |||
| Year | All Institutions | 4-Year Institutions | 2-Year Institutions |
| 2012–2013 | $19,344 | $22,261 | $9,180 |
| 2010–11 | $18,497 | $22,092 | $8,909 |
| 2009–10 | 17,649 | 21,093 | 8,533 |
| 2008–09 | 17,092 | 20,409 | 8,238 |
| 2007–08 | 16,231 | 19,363 | 7,637 |
| 2006–07 | 15,483 | 18,471 | 7,466 |
| 2005–06 | 14,634 | 17,451 | 7,236 |
| 2004–05 | 13,793 | 16,510 | 7,095 |
| 2003–04 | 12,953 | 15,505 | 6,705 |
| 2002–03 | 12,014 | 14,439 | 6,252 |
| 2001–02 | 11,380 | 13,639 | 5,718 |
| 2000–01 | 10,820 | 12,922 | 5,466 |
| 1990–91 | 6,562 | 7,602 | 3,930 |
| 1980–81 | 3,101 | 3,499 | 2,230 |
A) URL: http://www.statisticbrain.com/average-cost-of-college-tuition/
B) I know that I have data because I am able to answer the Who and What questions.
Who: Average cost of college including total tuition, room and board rates charged for full-time undergraduate students in degree-granting institutions for 1 year of college.
What: Year, all institutions, 4-year institutions, and 2-year institutions.
C) When: 1980-2013
Where: The United States
Why: To calculate what the average cost of college tuition a year is.
How: Through the U.S Department of Education, National Center for Education Statistics
D) Year is categorical, all institutions is categorical, 4-year institutions is categorical, and 2-categorical.
