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

CFA Level I Quant
#1

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.

#2

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

#3

^ +1

#4

Thank you so much, guys. Going to the flash cards now.

#5

My pleasure.

#6

I just finished writing an article on confidence intervals that may be of use: http://financialexamhelp123.com/confidence-intervals/