Hogle Manufacturing uses a standard costing system. The standard time to produce one unit is 4 hours, and normal production is 3,000 units monthly. Overhead costs were estimated to be $135,000. The standard variable overhead rate is $5 per machine hour. During April the following results were recorded: 
The variable overhead efficiency variance was
Definitions:
Forecasting
The act of making educated guesses about future occurrences based on patterns, trends, and data analysis.
Curvilinear Relationship
A relationship between two variables where the change in one variable does not consistently result in a proportional change in the other, often depicted as a curved graph.
Residual Plot
A graph that shows the residuals (the differences between observed and predicted values) on the vertical axis against the predicted values on the horizontal axis, used to evaluate the fit of a model.
Curvilinear Regression
A form of regression analysis in which the relationship between the independent variable and the dependent variable is modeled as an nth degree polynomial.
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