posted by Ayuda!!! .
Find the value of zα/2 to construct a confidence interval with level:
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions (.025 & .01, respectively) that relate to the Z scores.
95% interval = mean ± 1.96 SD, so Z = 1.96.
You do the second one.
I got it! the second one is Z = 2.326