The extent to which scores differ from each other is called central tendency. Variability in research data emanate from individual differences in the subjects being tested. If you are interested in studying minority incomes in the world, then minority incomes of all the minorities in the U.S. is a statistical population. A sample is designated as a random sample dependent on the actual scores included in the sample. A final measure that ranks people is a nominal measure.
Events are independent if The likely hood of one influences the likelihood of another.
If one event occurs another event cannot occur. If the probability of occurrence of one remains exactly the same regardless of whether the other event has occurred. If you do the event away from a crowd. Statistics summarize the characteristics of any group of people. Send mail to Mike Biderman with questions or comments about this web site.