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Calculating a P-value given a z statistic | AP Statistics | Khan Academy
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- Опубліковано 13 лют 2018
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Example showing how to use a standard normal table to estimate a P-value.
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AP Statistics on Khan Academy: Meet one of our writers for AP¨_ Statistics, Jeff. A former high school teacher for 10 years in Kalamazoo, Michigan, Jeff taught Algebra 1, Geometry, Algebra 2, Introductory Statistics, and AP¨_ Statistics. Today he's hard at work creating new exercises and articles for AP¨_ Statistics.
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You and Organic Chemistry Tutor deserve the metal of honor for helping me pass calculus, stats, and linear algebra
I just spent like 45 minutes ripping my hair out because I couldn't figure this out and this video saved my sanity.
Fr. I am currently studying for my Stats final, and I couldn't for the life of me figure out how to use the Z-Table.
Now, it makes more sense
I give Khan Academy 100% credit for my A in Statistics!
Literally just needed to know how to use the chart and LITERALLY no one else showed how!😭😭😭 I have a test in 15 minutes!😭 thank you! Adding to our teachers being not that great, now with online learning, they don't even respond to emails of queries concerning school work.🥺🥺 this saved me.
You are way better than my Stats professor, and he teaches at one of the top 5 MBA programs.
Thanks for the great video. If I may one question: 1:48, how did get that formula for sampling standard deviation (or error) ? Could you please advice? Thanks a lot!
After a long time,I just figured out now what is exactly p value with more precisely from diagram....
Thanku khan Academy ♥️
Sal please build online university.
It's a very helpful & easy technic. Thank You So Much.
You are a LEGEND. Thank you so much! This helped me so much! 😁
For some reason, when I do the calculations for the z score, my result is not 1.83 but 1.75. What could be the problem?
Same thing with me
I get the same result as you. I'm pretty sure it's a mistake in the video
I'm not sure where you're getting 1.75. I'm getting 1.645.
This value is also what I am seeing.
Y'all must be rounding when you shouldn't
Goodness me this video is superb. So concisely explained!
thank you! very helpful
Very clear explanation. Thanks.
shouldn't it be a right tailed test as we have to check the rejection region Ha(p) > 0.26?
this is true. but given that the z-table or standard normal distribution table is symmetric, we can actually use either side of the table (right or left) to get the same result
this is brilliant
you're the man!
This is a very clear video! Nice job
May God reward You in children as we say in Poland.
You are amazing. Thank you so much.
OMG I actually understood this 😁😁
how to calculate the p-value of the log rank test?
my problem was how to use the chart but now its no more, thank you
Thank you
What is p-value if z is 6.67. When z table is limited to 3.??????
If z statistic is larger than 3 or smaller than -3 the p-value will be very very small. The table doesn't need to stretch that far; you can delineate the p-value by saying p < 0.001
@@mariar7573 am I right in saying p> 0,001 if z= 8.94?
Sooo where do you get the p value table from?
Tahnkyu sir
Flour, fvao
How you decide the value 0.0336 as P value?
I couldn't Understand
You plug the z statistic that you just calculated into a z-table (standard normal distribution table). First you look up the tenths value and then hundredths
i wanna marry this man
I dont understand why you used a negative z table for a positive z value.
OH
hello sir its a two tail test so the value of P=.336*2=.0672.
it's not a two-tailed test actually. the alternative hypothesis p > 0.26 indicates directionality, and therefore that a one-tailed test should be used. two tailed would be p "not equal to" 0.26
I just came here for fun
last
I came here to find out if dream cheated. Calculated the z-score of getting 42 ender pearls in 262 trials as: 8.17. I still dont want to believe he cheated tho :(
Maximum amount of pearls he can get is 22.8 with a 0.01 confidence interval and he got 42!!
Third
when calculating the SE shouldn't be 0.33 not 0'26 for p
when calculating standard error for our test statistic, it should always be calculated in terms of the null hypothesis. in this case the null hypothesis = 0.26, so 0.26 is correct
fourth
second
Pee Value 💀
Am I being stupid? I'm trying to follow this through, I'm getting a z value of 1.748179927 not 1.83.
(0.33-0.26) / sqrt( (0.26*0.74)/120) ~= 1.75