Philadelphia Company has the following information for March: 
Determine the March (a) manufacturing margin, (b) contribution margin, and (c) operating income for Philadelphia Company.
Definitions:
Chi-square Technique
A statistical method used to assess the differences between observed frequencies and expected frequencies in one or more categories.
Qualitative Variables
Variables that describe or categorize attributes or characteristics of a sample or population, without implying any order or numerical value for comparison.
Goodness-of-fit-test
A statistical test used to determine how well sample data fit a distribution from a population with a normal distribution.
Contingency Table
A table used in statistics to show the frequency distribution of variables, helping in analyzing the relationship between them.
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