Radon is a colorless, odorless gas that is naturally released by rocks and soils and may concentrate in tightly closed houses. since radon is slightly radioactive, there is some concern that it may be a health hazard. radon detectors are sold to homeowners worried about this risk, but the detectors may be inaccurate. university researchers placed 30 radon detectors in a chamber where they were exposed to 105 picocuries per liter (pci/l) of radon over 3 days. the sample average reading from the 30 radon detectors was 103.03 pci/l. the population standard deviation is 5.1 pci/l. are the researchers able to conclude at the 5% significance level that the average reading differs from the true value of 105?