The quality control officer in a Coke manufacturing unit inspects the breaking strength of the glass bottles. The officer randomly selects a sample of 500 bottles from the production department to check the strength of the glass bottles. Do you think that the officer is justified in selecting the sample and he would be able to draw conclusions about the strength of all the bottles produced? Also, if the officer employs the formula given in Equation 8.1, which statistical measure will he compute first: the mean or the standard deviation? What do you think is required in Equation 8.1: population standard deviation or the sample standard deviation?