Each bottle of juice from a small company is supposed to contain exactly 12 fluid ounces. Susan is in charge of quality control and decided to test...

Each bottle of juice from a small company is supposed to contain exactly 12 fluid ounces.  Susan is in charge of quality control and decided to test this claim by gathering a SRS of 30 bottle.  She will recalibrate the machinery if the average amount of juice per bottle differs from 12 fluid ounces at the 1% level of significance.  Her sample of 30 bottles has an average of 11.92 fluid ounces and a sample standard deviation of 0.26 fluid ounces. Conduct a hypothesis test to determine if the machinery needs recalibration