How To... Perform a Z Test in R #84

Learn how to perform a z statistical test @EugeneOLoughlin.

The R script (84_How_To_Code.R) for this video is available to download from Github at:

[rishimaborah]

z test doesn't follows t-distribution. It should be pnorm() for z distribution

[its_eis]

Eugene you golden god, thank you for these videos.

[PIYUSHBAJAJ-etls]

Can you please tell, that how to find the Z-Test of 2 samples, where we have xbar1, xbar2, n1(Sample Size), n2, s1 (Standard Deviation), s2 and we have to use the inbuilt function of
Please clear this doubt

[nasongg]

Thank you. Shouldn't the null hypothesis always include equality?

[andrebouye]

Thank you so much for this helpfull video. But there is still something unclear.
Why didn't you write this code t.test(Weight, mu =1000, alternative ="less") on R?
With the same data base the computer answer : t= -2.509, df = 13, p-value =0.01307
95 percent confidence interval: -Inf 998.8864