z-Test Using P-Values TI-Nspire

[@Sami-vo1gq]

This helped me so much on my exam for stats. I had no idea how to find a z-score without looking at the chart. Hopefully this works on my exam! xx

[@morethanjustasloth5528]

My final gave me no standard deviation, what do I do?

[@MathandStatsHelp]

If you don't know the population standard deviation, you have to run a T-test. ua-cam.com/video/iKalGG-NzXI/v-deo.html

[@kaoh1778]

Thank you so much!!!

[@sleepr-uz1wk]

thanks so much this helped a lot

[@MathandStatsHelp]

Happy to hear that!

[@quantquill]

P-value is 0.0053, but isn't that actually 2 x P(z < -2.79)? Given this is a two-tailed test, the calculator has doubled the probability for us. P(z < -2.79) = 0.0026

[@MathandStatsHelp]

Quant Quill, yes the calculator automatically doubles the probability for us for the two tail test. I should have written 2*P(z

[@jorgelachica1101]

thanks!

[@MathandStatsHelp]

You're welcome!