Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value(s) used to test a null hypothesis. Indicate if z value(s) is/are za or za/2. Give each answer correct to 3 decimal places. (a) ? = 0.1 for a two-tailed test. (b) ? = 0.09 for a right-tailed test.
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For a two-tailed test with a significance level of 0.05, the critical z-value is ±1.96. This means that if the calculated z-value falls outside of this range, we can reject the null hypothesis. Show more…
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