Table shows a different random sampling of 20 cell phone models.
Best Practice Authored by: Jennifer Kensler, PhD STAT COE.
We estimate with 98% confidence that the true SAR mean for the population of cell phones in the United States is between 0.8809 and 1.1671 watts per kilogram. STAT COE-Report-20-2014 STAT T&E Center of Excellence 2950 Hobson Way Wright-Patterson AFB, OH 45433. To construct a confidence interval for a single unknown population mean \(\mu\), where the population standard deviation is known, we need \(\bar - EBM = 1.024 – 0.1431 = 1.1671\) If a simple random sample of size n is taken from a normal population with mean and standard deviation, then a (1 ) 100 confidence interval about 2 is given by the formulas below. Appendix: Critical Values Tables 434 Table A.1: Normal Critical Values for Confidence Levels Confidence Level, C Critical Value, z c 99 2.575 98 2.33 95 1.