Pressure vs.volume graphs for a certain gas undergoing five different cyclic processes are shown below.During which cycle does the gas do the greatest positive work? 
Definitions:
Equality Of Variances
A statistical condition in which two or more groups have the same variance, often an assumption in certain tests of significance.
Test Statistic
A calculated value used in statistical hypothesis testing to determine whether to reject the null hypothesis.
Chi-Square Test
A statistical test used to determine whether there is a significant association between two categorical variables.
Independence
A concept in probability and statistics indicating that two events or variables have no association or influence on each other.
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