| A | B |
|---|
| What is the use of a scatter plot graph? | to show whether a relationship exists between 2 var's |
| What are the 3 types of relationships with graphs? | Linear, non-linear & no relationship. |
| What is the probability formula? | # of favorable outcomes/ total # of outcomes |
| What is the 'and' rule in probability questions | You must multiply the seperate probabilites together |
| What is the 'or' rule mean in probability questions? | You must add the probabilities together |
| What is meant by 2 events are independant of each other | one outcome has no influence on the other outcome |
| Describe a positive correlation | pattern slopes up and right |
| Describes a negative correlation | pattern slopes down and right |
| Define no correlation | no pattern appears. |
| Discuss self-selective sampling | quick,easy method,but results does not fairly rep pop'n |
| Discuss cluster sampling | small sample, yields biased results, shared location |
| Discuss systematic sampling | from passers-by at regular intervals, diffic to collect |
| Discuss Simple random sampling | chosen at random from entire pop, 5% to 10% of pop |
| Discuss stratified random sampling | most difficult, most reliable of all methods, sep in gr |
