T-Statistic Confidence Interval

[drmugtaba]

Thankyou sooo much. Very enlightening!

[Wolowitz75]

is that always the case in t distributions??

[Wolowitz75]

why is the degree of freedom 9 if u have 10 samples?

[NormaDaBomb]

@Wolowitz75 To find degrees of freedom, it's n-1, with n=sample size. :}

[kircklin]

this is life saving, thank you so much

[sheri7rodrig]

These videos are so much easier to understand than my instructor! Thank you for posting them.

[kevnjenga]

I GIVE THANKS

[Tpathpslm557]

My exam is today at twelve, This is the BEST for last minute reviewing (:

[omen1913]

how do u get s=2.98 ??? thanks

[toysoldier7]

@omen1913 to get 2.98 for the standard deviation you find the variance by finding Sigma(X(i) - X(mean))^2/(n-1) you'll get 8.89 then to get standard deviation you just take the square root of that = 2.98

[rivariad]

awesome

[afaqkhanpwr]

Doesnt Sal use number of samples and number of data points interchangeably not only in this video but also in previous many videos? Sample to me is a combination of data points/observations. So, under root 10 is actually Not under root of 10 samples but of 10 data points. And this is important to differentiate otherwise we dont know wether we r talking abt 10 data points or 10 samples containing 10 data points....see it in the context of many previous videos.

[shantanudas]

@afaqkhanpwr Yes you are right.. it is easy to get confused about the usage. Often he has been saying the number of observations as number of samples - something he started during the explanation of central limit theorem.

[dalcde]

I was about to skip this video since I thought it was the same video (and I pressed on it twice)

[jsr9422]

was just testing out the blue number thingy. nothing was actually funny at 1.43 (i dont think)

[jsr9422]

lol 1:43 

[vickiormindyb]

If anybody knows where his statistics lessons begin, can you please tell me?

I have zero background in statistics, and I don't like them anyway.

Example: This year, 2.8 people in the population bought Gateway Computers.

Only if the third person is an amputee does that make any sense. How can you have 2.8 people?

[norwayte]

Very good. Seems a very good idea to use the same data (same example) for different analysis. It shows what questions can be asked and what answers you can give. Juggling with data. Maybe you use this example for even more analysis. Keep on going.

[thelastbattle19]

HI SAL :)