calculation of z distribution and t distribution

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


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.


Glad to hear your SIL doing better!!

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

Thanks, breadmaker!

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

Thanks so much for your help S200magician yes

My pleasure.

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