Sampling Methods and Bias

[@santharchu]

Great, this helped me so much! You explained so clearly and helped me understand a lot! Thank you!

[@ameenalgamal.9741]

I just wanted to thank you for all the video

[@diannalemus530]

You really did an excellent job of explaining this! Thanks! :)

[@mikediamond2422]

Exactly what i was looking for thank you so much!

[@thomasnguyen4943]

Good, explanations ! My professor talks like she's rapping really hard to understand. Thanks for the clarification :]

[@agnesgeoffrey157]

Asante, you are awesome!very helpful video

[@abidemiodesola657]

Hello Sir, I wanted to investigate the perception of consumers towards a retail format. So I constructed an online questionnaire on facebook for people to fill out and also printed it out and took it to the store for customers to fill out. I just wanted to get information from people who had shopped. I am little bit confused on the sampling method used.

[@DobynsBennettMath]

Well, how did you give it out at the store? Did you use a random number generator to generate a number (like 10) and then give every 10th person a questionnaire? If so, that would be systematic sampling. Did you give them out to everyone? Well, then you might have suffered from Convenience bias. Posting the survey on Facebook is Voluntary bias/Convenience bias. Your sampling method has to be random to be fair.

[@StanislavMudrets]

What do you call the bias where the person finds it hard to get to a place, so he/she goes to adjacent spot and asks people there instead?

[@DobynsBennettMath]

A little late, but that's convenience bias. The person is making choices that are convenient - not random.

[@dylandelaney56]

This helped a lot thanks!!

[@muhammedeminkizilkaya8014]

Thank you so much Adam!

[@khalidhussain2894]

Excellent lecture!!!!!!!!!!1111

[@raylance123]

Good explanations

[@jeromez7148]

It impossible to get the population distribution in practice

[@trucnguyen5726]

Awesome :D