i hate this video so much it sucks it’s awful you wasted 15 minutes of my time when you could have just said it in 5 please never post again i hate watching your videos for math

So clear and understandable...

Thanks. information is clear and understandable.

Thank you but next time make it a little short and less repetitive

The big difference between stratified and cluster sampling is that you take a sample from each and every stratum (yes formed as you wish, though some homogeneity within strata is desirable), whereas clusters are randomly selected from a bigger population of all clusters (yes, they are natural clumpings, easy to list and pick). You select within (all) strata, whereas you select (some) clusters at random. Your three nations example is stratified sampling if you only wanted to study those 3 countries, and took 50 folks from each. If you selected those three countries at random from many countries, then it is cluster sampling (hopefully you got a representative collection, though doubtful with only 3 countries), and if you then select 50 from each selected country cluster sample, it is two stage cluster sampling. If you sampled everyone in each randomly selected country, then it is simple cluster sampling.

Very nice video- clear, thorough and easy to understand. Thanks and god bless you.

voice is not clear and not understanding

Sorry but so boring Video and Explanation

Fabulous! I've been struggling with this all semester. You have made it so clear. Thank you so much.

thanks...understood every word... u have a beautiful voice