Question: The production line that packages boxes of raisins at a snack food manufacturer will be considered operating properly if the average weight of the boxes of raisins is 1.5 ounces with a standard deviation of 0.1 ounces. A random sample of 16 boxes showed an average weight of 1.45 ounces.

Provide the null and alternative hypothesis to determine if the production line is operating properly. What additional assumption is needed before we can perform a test to determine whether the production line is operating properly?