In order to determine whether or not a driver's education course improves the scores on a driving exam, a sample of 6 students were given the exam before and after taking the course. The results are shown below.Let d = Score After - Score Before. 
a.Compute the test statistic.
b.At 95% confidence using the p-value approach, test to see if taking the course actually increased scores on the driving exam.
Definitions:
Marginal Tax Rate
The tax rate applicable to the last dollar of an individual's or entity's taxable income.
Cost of Debt
The effective rate that a company pays on its current debt, which can include loans, bonds, and any other interest-bearing liabilities.
Market Risk Premium
The extra return expected by investors for holding a risky market portfolio instead of risk-free assets, reflecting the additional risk.
Dividend
The payment made by a corporation to an equity investor (stockholder).
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