Cellphones give off small amounts of radiation. Based on many cellphone tests, population standard deviation for cellphone radiation is known to be 0.337 watts per kilogram. For a prototype of a new phone, a sample of 49 phones had sample mean radiation of 1.010 watts per kilogram. In a 99% confidence interval, what is the margin of error for population mean radiation for this prototype? Round to 3 decimal places. Your