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Math - Interpreting Results of Statistics

The IRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Previous studies involved asking a set of 25 questions of a large number of IRS telephone representatives to determine the proportion of correct responses. Historically the average proportion of correct responses has been 70 percent. Recently IRS representatives have been receiving more training. On April 1, the set of 25 questions were asked again of 20 randomly selected IRS telephone representatives. The proportions of correc answers were 0.88, 0.76, 0.64, 1.00, 0.76, 0.76, 0.72, 0.88, 0.50, 0.50, 0.40, 1.00, 0.88, 1.00, 0.64, 0.76, 0.76, 0.88, 0.40 and 0.76. Interpret the results of that study.

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