Hi Brandon, this exercise helped me recalling my stats, 20 years of forgotten knowledge. I made connections and clarified ideas. This has been a long journey since your first video. You are blessed! Last time I did this I was a student working at night in a lab. This study marathon brought me very good memories. Thanks
I truly appreciate all the affirmations that you spoke over me as I watched this. Statistics has been a struggle for me in Business School but watching this just made me feel like a million bucks, God bless you. Keep up the good work
Hi Neda! Thank you for your nice words. I will definately look into MATLAB when I have the money to purchase it. But unfortunately right now it isn't an option. But I will be learning more about it in the meantime. Thanks! - B
Totally awesome. Thanks for your great work. If we have more people like you then less problems will exist in this world. Please keep making the good. What you are doing is one of the things that all the prophets and messengers of God came to teach. Noah, Ibrahim, Moses, Jesus and Muhammad may God peace and blessings be upon all of them. They came to teach people that we all came from the same father and mother (Adam and Eve). We should work together and help those who need help. We should worship God with sincere devotion. God rewards the people for doing the good. He rewards them in this life and then in the Hereafter (if they were doing the good seeking his pleasure). Please continue to do this great work and be sincere that you are seeking God's reward by helping his creations. Best wishes for you.
Thanks so much for everything you do. People like you who work hard in helping others move forward truly make this world much brighter :). Kudos and please keep up the good work!
Thank you so much for your videos! They are very helpful for people like me, who don´t have any experience in the statistic field. But I have a question: Why not taking always 2 samples of equal size to compare their variances? How does the sample size affect the variance?
As with my former experiences the video was once again very informative. I have a question though: If we always divide the larger variance with the smaller one, won't we always get an F-value above 1? This does not correspond to the distribution, where app. 30-50% of the probability lies between 0 and 1. Keep up the good work!
thanks for the clear explanation. Q1 ) i have seen in some books of the f-test that shows 2 tail tests when there is a equality sign involved. i am confused regarding how we can represent 2 tailed test in a f dist. Q2) does it make a difference if we have sample sizes greater then 30 ? Q3) why is it f.inv.rt? whats the difference between F.Dist.rt and this one? ( one is critical value approach and the other is p value?) sorry for the newbie questions.
Hello, I was just wondering how I can find the correct sequence of the videos. Your videos are perhaps the best. But I could not figure out how the videos are arranged from the beginning to end. I want to start from the very basic and go toward more complex concepts. Thanks for all you do for students and people like me, a professor who wants to refresh his statistics knowledge.
Thank you sir for your awesome explanation. Just wanted to know, what software you use to make these kind of awesome presentations. If you would help me then I would be very grateful to you.
Brandon,great videos sir.They are extremely helpful. I had a query.Is it possible to do the Gas problem by t test for difference of means? If yes,for a given problem similar to the Gas problem,how to decide which method to use: F-test or t-test?
What happens though if alpha value is 0.04? My table only has 0.05, .025, 0.01 and 0.001. Would you please do a video on how this can be calculated or please reply. Btw, your videos have been very useful thus far, however I've had a few questions along the way. I'd really like if you could respond to them.
how can you tell if the mean difference between two samples are high enough? is there a test for means? and do you use it in everyday analysis along with these variance testing?
Hello! Yes, all stats textbooks have F-tables in them and you can also find many online tools what will provide p-values for any F-value. Just need to make sure you have the correct degrees of freedom.
Good question! There are two main values we can find when working with probability distributions: 1) the area under the curve and 2) the value that marks the boundary of a give area. In Excel, the DIST functions provide the area under the curve as a decimal while INV provides the boundary of a given area. Kind of like a coloring book. INV is the outline while DIST is the part you color in. Hope that helps!
When using F stat chart, should I look at the one with alpha=0.05 or 0.025 in the right tail? Also, why wouldn't you use 0.025 since the null hypothesis has equal sign, not inequality sign?
Hi Neda! Thank you for your nice words. I will definately look into MATLAB when I have the money to purchase it. But unfortunately right now it isn't an option. But I will be learning more about it in the meantime. Thanks! - B
