The daily production rates for a sample of factory workers before and after a training program are shown below. Let d = After - Before. 
We want to determine if the training program was effective.
a.Give the hypotheses for this problem.
b.Compute the test statistic.
c.At 95% confidence, test the hypotheses. That is, did the training program actually increase the production rates?
Definitions:
Cumulative Effect
The total impact of a change in accounting principle or correction of an error reported in a single period's financial statements.
Change In Accounting Principle
An adjustment made to the accounting methods used by a company, often requiring retrospective application to prior period financial statements.
Net Income
The remaining earnings of a firm once subtracting every expense and tax from its total income.
Extraordinary Item
Events or transactions that are distinct from the ordinary activities of a company, which are unusual in nature and infrequent in occurrence.
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