Confidence Intervals about the Mean, Population Standard Deviation Unknown

[danielles]

I spent hours trying to figure this out from an unhelpful textbook and online course material and you made it so easy! Thank you!!!

[tangeniimmanuel]

FOr those of you confused, we are using the t distribution BECAUSE the sample n is less than 30, the standard deviation is 80 and is actually in the video...In other words, it is known

[joshua]

It is, quite frankly, embarrassing that you can explain this better than my professor who requires an hour to explain the same subject and yet still fails to get across the point. They get paid to do their job and they can't even do it properly. Many thanks for the assistance.

[GSDAmber]

10 years later and you saved my life, I appreciate this vidoe

[nickhilgen]

Thanks man, still helping people 5 years in the future!

[thegoonist]

this is the go-to explanation on this topic. seen a bunch of other vids and they werent as clear and concise.

[RolSBW]

Thank you for your contribution ! It is clear. I will apply it right now to my experimental data to get the CI.

[PurePhantom]

[t_(n-1)] uses the Degrees of Freedom, whereas the [t_a/2] uses the probability. Other than using different values, there probably isn't any difference between the two as you need both values to find the t-value on the t distribution table. The use of either one probably just depends on how you were taught stats (ie. whichever one your teacher uses)

[MikeyAug]

Thanx dude...my teacher isn't unable to teach it so simple!

[ashraafasri]

tmrw i got this statistic exam and now i just found the video?! anyway thanks for a great explainantion mr.statistic. :)

[giftnyoni]

THANKS MAN HOW ABOUT IF THE VARIANCE AND STANDARD DEVIATION IS NOT GIVEN BUT YOU ARE ONLY GIVEN SAMPLE DATA

[idkman]

Best video I've seen on the subject

[dreibelt]

Thank you. That was a great explanation.

[shuwukong]

population standard deviation, sigma, is unknown
80 refers to the sample standard deviation, s

[YeahsCee]

This video is old but thank you so much for explaining this! I really appreciate it. :) Explanations and examples can be difficult to follow through just text. Have a good day. xx

[tmb]

Population standard deviation was 80. Said so right from the beginning. How do you find it if that value is unknown?

[sandilehlabangane]

Thank you very much this video helped me a lot

[gollaprakash]

superb sir...please send link introduction of chi-square test and when it is used....differnces between t-test, f-test and chi-square....waiting for video....

[havanaaa]

so to do confidence interval when the standard deviation is unknown, I'll need a distribution table?

[JohnWilson-epcm]

It's supposed to be 2.064 for 24 degrees of freedom and 0.025