Use the sample data listed in Exercise 18 with a 0.05 significance level to test the claim that the sample is from a population with a mean less than 1.6 W/kg.

Exercise 18

Listed below are the measured “specific absorption rates” (SARs) of radiation (in watts per kilogram, or W/kg) from a sample of cell phones (when held to the head). The data are from the Environmental Working Group. The media often present reports about the dangers of cell phone radiation as a cause of cancer. SAR is assumed to be normally distributed for all cell phones. Construct a 95% confidence interval estimate of the population mean. What does the result suggest about the Federal Communications Commission (FCC) standard that cell phone radiation must be 1.6 W/kg or less?

0.38 0.55 1.54 1.55 0.50 0.60 0.92 0.96 1.00 0.86 1.46