A soft drink filling machine, when in perfect adjustment, fills bottles with 12 ounces of soft drink. A random sample of 25 bottles is selected, and the contents are measured. The sample yielded a mean content of 11.88 ounces, with a standard deviation
of 0.24 ounce. With a .05 level of significance, test to see if the machine is in perfect adjustment. Assume the distribution of the population is normal.
H0: ? = 12
Ha: ? ? 12 t = –2.5; therefore, reject H0 . There is sufficient evidence at ? = .05 to conclude that the machine is NOT in perfect adjustment.
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