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

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

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.

FTFY.

Glad to hear your SIL doing better!!

FTF_ **Y** _! (Though my first answer was clearly wrong.)

breadmaker:

Glad to hear your SIL doing better!!

Thanks, breadmaker!

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

Thanks so much for your help S200magician

My pleasure.

Why, then, do you discount me by 90%?