Vijay Pradhan, Vice-President in charge of operations for Humanity Health Corporation, is concerned about an aging population of medical professional, particularly medical doctors who care for patients in residential health care facilities statewide. He wants to estimate their mean age with 95% confidence, accurate to within 2 years. Published research in the field states the standard deviation for the ages of such medical doctors as approximately 8 years. What is the absolute value of the standard normal or z score that corresponds to this context? [COMMENTS & HINTS: Recall that the two-tailed critical values represents alpha divided by two. Report your answer without any sign, rounded to two decimal places.]