Posted by Ayuda!!! on Friday, October 28, 2011 at 4:25pm.
Find the value of zα/2 to construct a confidence interval with level:
a. 95%
b. 98%

statistics  PsyDAG, Saturday, October 29, 2011 at 12:31pm
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.

statistics  Ayuda!!!, Saturday, October 29, 2011 at 1:40pm
I got it! the second one is Z = 2.326
Thanks!!! :)
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