Chi-square test for association (independence) | AP Statistics | Khan Academy
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- Опубліковано 11 вер 2024
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Chi-square test for association/independence.
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Just a quick note to students following along... take care when using this method, because he is using percentages. Just moving the decimal two places over does NOT WORK unless your grand total is 100. Instead, either convert to a percentage *or* Just multiply row total * column total then divide by grand total. For the first cell, 22*25/100 = 5.5 expected.
Thank you so much, I was wondering that!
You goat
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Khan Academy - love you long time! You deserve so many more likes!
This guy deserves a Nobel prize.
What is the difference between chi square test of proportions vs. chi square of independence?
Crystal clear, thanks!
How to know whether the result is extreme?
thank you so much ! love from india :)
What to do for correlation of 2 ordinal datasets if not monotonic can we do chi square?
Also how to do it
Do you have a video on Chi Square test for more than 2 variables? Thanks and Great job!
Amazing
"...at least this large, or larger". Helpful video nonetheless!
Understood. Thanx
You know what they say about big feet.
They wear long socks?
They have a large shoe size?
How did he get the p value of 0.018? Do anybody know?
He most likely looked at a chi-squared distribution. You can find them online.
Take the integral from the test-statistic to the right using the chi-squared PDF for 4 df.
@Aniketh Mukhirala
That's unlikely - and I have looked. To tabulate p-values to 3 dp requires a 1000 columns for each chi-squared CDF (degree of freedom).
Hi Sal, is the p-value at 9:14 the p-value from the chi-critical or from the hypothesis test? One more question, would we ever do run a chi-square per row instead of for all data cells? Thank you for your great videos!
Thanks Best explain of chi square test
best explanation!
The p value according to the Chi square table for a DF of 4 and significance level of 0.05 is 9.488 but here it is 0.018. Am I missing something?
yeah, same question, anyone pls tell me...
In A-level maths we comapre the chi-squared value, but here he has compared the p value instead. 9.488 is a chi-squared value which came from DF4 and p0.95. I assume he used his calculated value for chi-square and DF4 to come up with a 2nd p value to compare. Not possible on the chi-squared table I have for A-level maths in the UK, but probably easy enough with the right software.
how do you find a p value using a calculator???
Verry urgent question! What about when looking at differences? How do you interpret the p value then? Doe this mean that there ia a significant difference between groups?
not too sure probably something on the calculator
Did anyone recognize that when he as calculating the expected values he said multiply by 100 rather than divide by 100?
That's because he is multiplying frequencies and not absolute numbers.
Clear 👌👍
fo you mean divide by hundred.
how did he make up the x=0.05?
andi shen When thé significance level isn't given, you can assume that x = 0.05.
thats the standard level of significance if not given
How will you get the significance level?
You make up your own. The most common is 0.05 in statistics, but medical studies often use 0.01.
why it is not in urdu
how did you get the p value?
@Tim DaHuman but how did he get there? it seems like he plucked 0.018 out of no where and I am very confused