When to use standard error vs standard deviation in z and t-tests?

[Charm]

I'm having trouble understanding when is the correct time to use a standard error vs a standard deviation in the denominator in hypothesis testing?

 

[shesnaps]

I'm not sure if this is the correct forum but I'm having a problem understanding the difference between the two below.
I'm sure I'm missing something basic here but I appreciate if someone could explain the difference and when I will interpret one over the other.

Thank you.

 

[ktrathen]

@jdelasalas.frm check out this video:

@shesnaps

I'm going to suggest that you spend a month doing the Khan Academy (free) course on statistics and probability: https://www.khanacademy.org/math/statistics-probability

I did this in the early part of my FRM part 1 preparation, and it really helped. Built a solid foundation for all the other concepts.

 

[shesnaps]

@jdelasalas.frm check out this video:

@shesnaps

I'm going to suggest that you spend a month doing the Khan Academy (free) course on statistics and probability: https://www.khanacademy.org/math/statistics-probability

I did this in the early part of my FRM part 1 preparation, and it really helped. Built a solid foundation for all the other concepts.

Thank you for your suggestion. I will check it out!