Sample and Population Videos
Identify Random Sample: Samples are used to make generalization of a group because a census is very time-consuming. Conducting a survey with a sample of the group, you can often get good ideas of what the population itself will say.
Generate a Representative Sample: The three types of representative samples, simple random sample, stratified random sample, and systematic random sample. Simple random sample is arbitrary, stratified random sample is making different groups out of the whole (more careful at looking who they choose), and the systematic random sample is random again, but more systematic, like every 3rd person. These methods help come up with a reasonable guess for whatever is being surveyed.
Understand Sample Bias: Samples can easily be biased, coming from only people who think in one way. Valid samples have different people with different opinions. For example, if there is a survey on what elementary schoolers do at recess, a biased sample would be only kindergartners, whose answers could be very different from a fifth grader.
Generate a Representative Sample: The three types of representative samples, simple random sample, stratified random sample, and systematic random sample. Simple random sample is arbitrary, stratified random sample is making different groups out of the whole (more careful at looking who they choose), and the systematic random sample is random again, but more systematic, like every 3rd person. These methods help come up with a reasonable guess for whatever is being surveyed.
Understand Sample Bias: Samples can easily be biased, coming from only people who think in one way. Valid samples have different people with different opinions. For example, if there is a survey on what elementary schoolers do at recess, a biased sample would be only kindergartners, whose answers could be very different from a fifth grader.
Comments
Post a Comment