ABSTRACT
As described in Chapter 24, testing a statistical hypothesis concerning a population mean involves construction of a rule for deciding, on the basis of a random sample from the population, whether or not to reject the hypothesis being tested, i.e., the so-called null hypothesis. The test is formulated in terms of a test statistic, i.e., some function of the sample observations. In the case of a large sample (n > 30), testing a hypothesis concerning the population mean, μ, involves use of the following test statistic:() Z = X ¯ − μ 0 σ n https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429124754/be33da89-95f5-45e7-a067-f2fa13b8eb97/content/eq1340.tif"/>
