$$\text { TABLE 12-14 }$$ A Filling Machine at a Local Soft Drinks Company Is

$$\text { TABLE 12-14 }$$ A filling machine at a local soft drinks company is calibrated to fill the cans at an average amount of 12 fluid ounces and a standard deviation of 0.5 ounces. The company wants to test whether the standard deviation of the amount filled by the machine is indeed 0.5 ounces. A random sample of 15 cans filled by the machine reveals a standard deviation of 0.67 ounces.
-Referring to Table 12-14, in order to perform the test, we need to assume that the amount filled by the machine has a normal distribution.