Hi, Rick, I have also been trying to find documentation on what procedure to run and what attributes to specify for a one-sample z-test. I was wondering if you could help me figure this out? In my dataset, I have data on 58 people, so the standard deviation, mean and distributions are all known. My data is being compared to the U.S. population norm data collected by a survey company. The only thing that is known from their data is the mean and the standard deviation. So I would like to run a one-sample z-test that compares my mean against theirs with the null hypothesis being: "There is no difference in the means between the two populations". A couple of questions: 1. The standard deviation needs to be known for which population, or is it both of them? 2. Why is it so difficult to find a tutorial on this via Google? Any time I find anything regarding doing a z-test, I mostly get t-test instructions instead, or, if I do get a z-test instructions, I get tutorials on knowing the variance and not specifically how to do a z-test in SAS, but by-hand calculations instead. And if I do get an SAS tutorial, there is nothing said in any example about inputting anything about the variance for PROC FREQ (I'm assuming this is the z-test). So, I gather from your questions, that you have to know the variance for a z-test, then why isn't it talked about in tutorials or specified in PROC FREQ examples, like h0 is? Confused!!!
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