1. Define confidence interval and confidence level. (2 points) 2. What is a critical z-value, and how is it related to the confidence level? Describe how you would look up the critical z-value for a 72% confidence interval on a normal curve table. What is the critical z-value for a 72% confidence interval? (3 points) 3. Fill in the table below. (1 point) Confidence Critical Z- Level value (z*) 90 95 991. ) A confidence interval is the mean of your estimate plus and minus the variation in that estimate . This is the range of Values you expect your estimate to fall between if you redo your test, within a certain level of confidence . The confidence level is the percentage of times you expect to get close to the same estimate IF you run your experiment again or resample the population in the same way . 2. ) A critical Z-value is the value on the normal distribution curve which seperates the acceptable and rejection regions. The values which are oursicle the critical z-valve falls in the rejection region cind on the inside it fills In the acceptance region . The confidence interval clenotes what values will Fall in the specified region. The critical value for a given confidence interval Shows us what scores will be accepted and rejected . The critical Z -value for a 72% confidence interval is - 1.08 3.) Confidence Critical Z- Level Value ( 2* ) 90 1. 645 95 1. 9600 2.5758