2010 March 30 / j d a v i s @ c a r l e t o n . e d u
Here's a frequency table for passengers on the Titanic, sorted by class.
| Class | Count |
|---|---|
| First | 325 |
| Second | 285 |
| Third | 706 |
| Crew | 885 |
Here's the corresponding relative frequency table.
| Class | % |
|---|---|
| First | 14.77 |
| Second | 12.95 |
| Third | 32.08 |
| Crew | 40.21 |
Here's a contingency table for comparing class to survival.
| First | Second | Third | Crew | Total | |
|---|---|---|---|---|---|
| Alive | 203 | 118 | 178 | 212 | 711 |
| Dead | 122 | 167 | 528 | 673 | 1490 |
| Total | 325 | 285 | 706 | 885 | 2201 |
Here's the conditional distribution for class, conditioned on each survival value. (Each cell's value is expressed as a percentage of the row total.)
| First | Second | Third | Crew | Total | |
|---|---|---|---|---|---|
| Alive | 28.6% | 16.6% | 25.0% | 29.8% | 100% |
| Dead | 8.2% | 11.2% | 35.4% | 45.2% | 100% |
Here's the conditional distribution for survival, conditioned on each class value. (Each cell's value is expressed as a percentage of the column total.)
| First | Second | Third | Crew | |
|---|---|---|---|---|
| Alive | 62.5% | 41.4% | 25.2% | 24.0% |
| Dead | 37.5% | 58.6% | 74.8% | 76.0% |
| Total | 100% | 100% | 100% | 100% |
Here are data from our introductory class survey. What questions are raised, and what conclusions do you draw?
| Yes | No | Total | |
|---|---|---|---|
| Female | 10 | 1 | 11 |
| Male | 16 | 5 | 21 |
| Total | 26 | 6 | 32 |
These data come from your book — Chapter 3, Question 42. What do you think?
| Tattoo (parlor) | Tattoo (elsewhere) | No tattoo | |
|---|---|---|---|
| Hepatitus C | 17 | 8 | 18 |
| No hepatitus C | 35 | 53 | 495 |
Here are 32 heights (in inches) for our class, ranging from 59 to 76. Draw a histogram. Describe the shape.
59, 61, 64, 64, 65, 65, 66, 67, 67, 67, 67, 67, 68, 69, 69, 70, 70, 70, 70, 71, 72, 72, 72, 72, 72, 72, 72, 73, 73, 73, 74, 76
Here are the heights of the 11 women and the 21 men, separately.
59, 61, 64, 65, 65, 66, 67, 67, 67, 68, 70
64, 67, 67, 69, 69, 70, 70, 70, 71, 72, 72, 72, 72, 72, 72, 72, 73, 73, 73, 74, 76
Here are 32 estimates of Brazil's population, in millions. Draw a histogram. Describe its shape.
0.225, 1, 10, 18, 25, 75, 80, 90, 100, 100, 100, 140, 150, 175, 180, 200, 200, 200, 200, 200, 200, 200, 209, 210, 265, 300, 300, 300, 310, 350, 450, 545
Here are the 32 economic and social views (1 means very conservative, and 5 means very liberal).
3, 4, 4, 3, 3, 2, 2, 4, 2, 2, 3, 4, 4, 3, 3, 2, 2, 2, 4, 3, 2, 4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4
4, 5, 5, 3, 4, 3, 4, 4, 3, 5, 5, 4, 5, 4, 4, 2, 3, 4, 4, 5, 2, 3, 3, 5, 4, 5, 4, 4, 3, 4, 4, 4
What can you infer about income distribution in the USA? How about in Canada vs. Switzerland?
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