Every z table provides different areas under the curve. The table you must be looking at give the area from negative infinity to the z score. My table gives the area from the mean to the z score.
In that step, I am using a z table to find the tail area I need. If you have a z table that provides tail areas, you could look up that area directly. However, the table I used only gives the area from the mean to the z score you look up. Since the upper half of the curve has 50% of the area, I can subtract the table value from 0.50 to find the tail area beyond the z value.
This video may be old but will live on for confused stats students like me. Thank you.
That’s good to read!
Your video clear my Problem it helps me allot thank you so much
I’m glad it was helpful!
what if my p-value is less than my alpha? what's the written conclusion?
You are the best!!!!
Thanks 😊
1.5.05 on z score table is 9394 not 4394 if I'm mistaken ?
Every z table provides different areas under the curve. The table you must be looking at give the area from negative infinity to the z score. My table gives the area from the mean to the z score.
hello what if my problem does not include the x value how would I be able to find that? Problem only includes H0: p=0.5, p-value = 0.025, and n=225.
If you are given a sample proportion, p, you do not need x. X is used to calculate p-hat (the sample proportion) when it is not given.
Thank you
You’re welcome
Why did u subtract .4394 from .5000?
In that step, I am using a z table to find the tail area I need. If you have a z table that provides tail areas, you could look up that area directly. However, the table I used only gives the area from the mean to the z score you look up. Since the upper half of the curve has 50% of the area, I can subtract the table value from 0.50 to find the tail area beyond the z value.