Purina produces dog food sold in 40 lb. bags. When the filling process is working properly, the standard deviation for the bag weights is 1.4 ounces. The following data represent a random sample of 30 bags from this process. The data can also be found in the Excel file Purina dog food.xlsx.

a. Using α = 0.05, determine if the filling process is performing satisfactorily.

b. Verify your results using PH_Stat.

c. Interpret the p value obtained from the software.

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