An article reports the results of an analysis of salespersons€™ performance level as a function of two factors: task difficulty and effort. Included in the article is the following ANOVA table:

a. How many levels of task difficulty were studied?
b. How many levels of effort were studied?
c. Are there any significant task difficulty main effects?
d. Are there any significant effort main effects?
e. Are there any significant interactions of the two factors? Explain.

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Variable Task difficulty Effort Interaction df F Value 0.39 0.0001 0.5357 1 53.27 1.95 0.1649