Thank you! Your encouragement means a lot. We have some thoughts in the pipeline for better connect with our patrons like you. Probably we'll be able to get back soon.
Good question! The biggest challenge associated with z test is that it requires the population standard deviation. Knowing population standard deviation means we know the population, and if we know the population we won't need inferential statistics. Therefore, for all practical reasons generally a t test is preferred. 😊
@@taibatabowaba9828 We can easily calculate sample standard deviation, but knowing population standard deviation is not so easy. To be able to calculate population standard deviation we first need to have access to the population. If we have access to the population there won't be a need to perform inferential statistics and hypoyhesis testing.
thanks a lot for this great video; is it possible to access the notebook code as well?
Thank you! Due to some IP infringement issues in the past, we don't post the code.
You explain things so well and in so details.. hello i am a fresher data analyst... is there a way to connect you??
Thank you! Your encouragement means a lot. We have some thoughts in the pipeline for better connect with our patrons like you. Probably we'll be able to get back soon.
Same with me. I would really like to connect to you@@prosmartanalytics
you guys have a website?
Yes, it is sixsigmaprosmart.com
Your way of teaching is very clear and understandable, is there any way that we can connect?
Thank you! Sometime in near future, till then please stay connected with this channel.
Great video! But may I ask why we wanted to use t-test and not z-test? given we are dealing with a large dataset? Thanks!
Good question! The biggest challenge associated with z test is that it requires the population standard deviation. Knowing population standard deviation means we know the population, and if we know the population we won't need inferential statistics. Therefore, for all practical reasons generally a t test is preferred. 😊
@@prosmartanalytics Got it!! Thanks for the prompt response!!!
Welcome! We have a complete playlist on hypothesis testing, you may go through it if you are interested in this topic.
@@prosmartanalytics hello. but can the standard deviation not be calculated?
@@taibatabowaba9828 We can easily calculate sample standard deviation, but knowing population standard deviation is not so easy. To be able to calculate population standard deviation we first need to have access to the population. If we have access to the population there won't be a need to perform inferential statistics and hypoyhesis testing.