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The test statistic is the z-score (or t-score) of the x-bar. e) Are you using z or t? Why? We are using z because the standard deviation of the population, sigma, has been given. f) Find the critical value, and label it in the graph. This is a left tailed test. Since α = .01, the critical value is the z-score that has an area of 0.01 to its left. ................
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