The Next Questions Are Based on the Following Information

Essay

The Next Questions Are Based On The Following Information:
A pharmaceutical manufacturer is concerned that the mean impurity concentration in pills should not exceed 3%.It is known that from a particular production run impurity concentrations follow a normal distribution with a standard deviation 0.4%.A random sample of 36 pills from a production run was checked,and the sample mean impurity concentration was found to be 3.09%.
-Test at the 5% level,the null hypothesis that the population mean impurity concentration is 2% or less against the alternative that it is more than 3%.