Math HW videos - Random Samples

Identify a Representative Sample:

If you use unbiased samples it will lead you to the representative sample by, doing this you will get a valid inference that will give you an answer that won't be biased.

Make Estimates About a Population using means: 

You should do more than one sample but, you may get different answers so you need to find the mean for that certain part of the sample.

Use Proportions to Make Estimates about a population:

To find an estimate you need to get a sample of people and find what the right number to multiply is for the exact number of the population. Then for the information you collected for the sample you multiply the number you multiplied by before to find an estimate for the population.
Assess whether an inference is valid: 

Using multiple samples can make sure you get a more accurate answer, to confirm or change inferences.