3. A two-tailed test is to be performed at the 15% significance level. Round all decimals answers to two decimal places X.XX a) What is the confidence level? __ % b) What are the critical values? The left critical value is z = and the right critical value is z = 4. A left-tailed test is to be performed at the 8% significance level. Round all decimal answers to two decimal places X.XX a) What is the confidence level? __ % b) What is the critical value? z = 5. A right-tailed test is to be performed at the 3% significance level. Round all decimal answers to two decimal places X.XX a) What is the confidence level? __ % b) What is the critical value? z =