A researcher expects a treatment to produce a decrease in the population mean. Assuming a normal distribution, what is the critical z-score for a one-tailed test with a = .01? 1.-1.65 2.-2.33 3.-2.58 4.+2.58
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The researcher expects a decrease in the population mean, which indicates a one-tailed test. Since the researcher is looking for a decrease, this will be a left-tailed test. Show more…
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