Finding the p-value in one-sample Z tests

I work through a few quick examples of determining what area corresponds to the p-value in one-sample Z tests on the population mean mu. The same logic holds for other types of test. I assume that you know how to find areas under the standard normal curve.

[junowhatt]

On a TI-84...
1. Hit STAT
2. Go to TESTS on the far right hand side.
3. Go down to "5: 1-PropZTest"
4. Plug in all the numbers. (Po is the null hypothesis, n is the sample total, x is the amount given within the sample.)
5. Be wary of the PROP section. (not equal to, less than, or greater than)
6. You're welcome.

[geoffluw]

This is the simplest and most precise explanation i have ever found on Youtube. JB, you are the best!! Thank you.

[zenchilladas]

Not helpful for actually how to find P-value at all. lol.

[Westcoast-Carolina]

On the first example, I found. 0764 on the negative side of the z-scores. Shouldnt the score be ..9236 if it's a right tail test?

[elitziri]

Incredibly amazing how well you explain things!

[jbstatistics]

It is found from the standard normal distribution, using either software or a standard normal table. At this point in a typical statistics course, students have long since encountered the standard normal distribution, and are able to find these areas. If you need to learn how to find these areas, I have videos illustrating how to do so. I also have an annotation link at the appropriate point of this video, saying "Don't know how to find this area? Click here to watch me find it using a table."

[TheVanilla]

This is really helpful, you explained it way better than my prof! Thank you so much

[Pringlescant]

Doesn't the formula for the Z score not include the square root of the sample? From my 2 minutes of research its the (observed value - mean of the sample)/Standard Deviation of the sample. There is no Square root of the number of samples in the formula.

[salami]

is there a way you can find the p-value without looking at the table ?

[ajazbashirable]

Shouldn't  Z=0.73 be on the left side. If Ha has < sign then it is left tailed test. Right?

[ParagSen]

But then why the p-values differ based on the significance level?

[ajazbashirable]

How did you get 0.0764 for the Z score of 1.43? This is the value for -1.43. I hope I am not confused. If you check the Statistics table for -1.43, you will get 0.076, but here we have a right tailed test hence + 1.43. SO we check the positive table for Z score which gives us 0.9082 value for + 1.43. Please help me  understand this. Thank you for all your effort.

[mookslovely]

For last one where did the area come from? You have to be more detailed

[desigamer]

Watch this video only if you already know how to calculate area from z table.


Thanks. You saved my ass!

[ajazbashir]

I have always learnt that if there is a < sign in Ha (H1) then it is a left tailed test and if there is > sign the a right failed test. I am feeling a little confused. I also want to thank you for the videos and the reply. God bless.

[thameerasri]

I need p value of left tailed, right tailed, two tailed if z value is 1.75 ho is rejected at alpha value 5%

[thefryingpan]

wtf do you mean so how do we find the p value -_-

[kangchychydx]

why don't you how to find p-value

[maths]

Very Useful Sharing and Nice Teaching always.

[eatalotmonster]

THANKS SO MUCH OMG LIFE SAVER. I WAS GOING MENTAL TILL I WATCHED YOUR VIDEO. HOPE I ACE STATS. U R AWESOME!!!!111!!!!11!!