Critical Values Z and T Lab. 1. Confidence Intervals. Find a. 80% ind z to 3 decimal places. Include a sketch labeling the area in confidence and the tail areas. (Do not shade.) b. 90% c. 96% 2. Percentiles. Find Za to 3 decimal places. Include a sketch labeling the two areas separated by Za (Do not shade.) a. 80th Percentile. b. 92nd Percentile. 3. Confidence Intervals. Find Te to 3 decimal places if df = 17. Include a sketch labeling the area in confidence and the tail areas. (Do not shade.) a. 80% b. 90% c.96%

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