Hushovd Iron Works has collected the following data for its Thunderbolt line of products: 
What is the direct materials quantity variance?
Definitions:
Null Hypothesis
A hypothesis that states there is no statistical significance between the two variables being studied, essentially stating that any observed effect is due to chance.
Independent Variable
The variable in an experimental setting that is manipulated to observe its effect on a dependent variable.
Random Error
Variability in data that arises from unpredictable fluctuations in the measurement process.
Null Hypothesis
A statement in statistics that proposes there is no significant effect or difference between specified populations, any observed difference being due to sampling or experimental error.
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