One-Sample z-test Requirements : Normally distributed population, known σ Test for population mean Hypothesis test Formula : where is the sample mean, Δ is a specified value to be tested, is the population standard σ deviation, and n is the size of the sample. Look up the significance level of the z-value in the standard normal table (Table in Appendix ). A herd of 1,500 steer was fed a special high-protein grain for a month. A random sample of 29 were
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