A soft drink filling machine, when in perfect adjustment, fills the bottles with 20 ounces of soft drink. A random sample of 49 bottles is selected,...

A soft drink filling machine, when in perfect adjustment, fills the bottles with 20 ounces of soft drink. A random sample of 49 bottles is selected, and the contents are measured. The sample yielded a mean content of 19.88 ounces with a standard deviation of 0.35 ounces. At 95% confidence using the p-value approach, test the hypothesis.