calculation of z distribution and t distribution

[archived_user]

Hello All,
Can you please explain how to calculate Z distribution and T distribution on exams. Or I havet to memorize all the distribution.
Thanks in advance
Kumar

 

[archived_user]

You have to memorize the common values for the standard normal (z) distribution:

• 65% 68% (1σ)
• 90% (1.645σ (you can use 1.65σ))
• 95% (1.96σ)
• 99% (2.58σ)

For any other values of a z-distribution, they’ll give you an excerpt from a z-table.
For any values of a t-distribution, they’ll give you an excerpt from a t-table.

 

[archived_user]

S2000magician wrote:
You have to memorize the common values for the standard normal (z) distribution:

• 65 84% (1σ)
• 90% (1.645σ (you can use 1.65σ))
• 95% (1.96σ)
• 99% (2.58σ)

For any other values of a z-distribution, they’ll give you an excerpt from a z-table.
For any values of a t-distribution, they’ll give you an excerpt from a t-table.

FTFY.
Glad to hear your SIL doing better!!

 

[archived_user]

breadmaker wrote:

S2000magician wrote: You have to memorize the common values for the standard normal (z) distribution:

• 65% 84% 68% (1σ)
• 90% (1.645σ (you can use 1.65σ))
• 95% (1.96σ)
• 99% (2.58σ)

For any other values of a z-distribution, they’ll give you an excerpt from a z-table.
For any values of a t-distribution, they’ll give you an excerpt from a t-table.

FTFY.

FTFY! (Though my first answer was clearly wrong.)

breadmaker wrote: Glad to hear your SIL doing better!!

Thanks, breadmaker!

 

[archived_user]

I was looking at things from the cumulative distribution point of view, whereas S2000magician is using the 2-sided interval. My bad!

 

[archived_user]

Thanks so much for your help S200magician

 

[archived_user]

My pleasure.
Why, then, do you discount me by 90%?