The maximum acceptable level for exposure to microwave radia

The maximum acceptable level for exposure to microwave radiation is 10 W/cm2. It is feared that a large television transmitter is polluting a region nearby. A sample of 25 readings is selected at random over a one-week pe- riod with a sample mean of X = 10.3 and sample variance of s2 = 4.

(a) Calculate the 95% confidence interval for the mean output of the power supplies.

(b) Based on your results above would you reject the null hypothesis that the microwave radiation is at an acceptable level?

Solution