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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