confidence interval of a population mean -- do I need to memorize this?

[chanalyst]

Is it necessary to memorize these figures for the exam or will they be provided?
zα/2
= 1.645 for 90% confidence intervals (the significance level is 10%, 5% in each tail).
= 1.960 for 95% confidence intervals (the significance level is 5%, 2.5% in each tail).
= 2.575 for 99% confidence intervals (the significance level is 1%, 0.5% in each tail).
Thanks.

 

[S2000magician]

Yes, as well as 1.0 (68%): on the real exam they won’t give you the critical z-values for these confidence levels.

 

[dwheats]

^ +1