The production line that packages bags of almonds at a snack food manufacturer will be considered operating properly if the average weight of the bags of almonds is 2.3 ounces with a standard deviation of 0.09 ounces. A random sample of 14 boxes showed an average weight of 1.54 ounces.
What additional assumption is needed before we can perform a test to determine whether the production line is operating properly?
| a. The sample standard devotion needs to be known. |
| b. The population mean needs to be known. |
| c. The population standard deviation needs to be known. |
| d. The population distribution of the weight has to be normal. |
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