In order to determine whether or not a driver's education course improves the scores on a driving exam, a sample of 6 drivers were given the exam before and after taking the course. The results are shown below. Assume the population of differences is normally distributed. Ho: HAfter Before Driver 1 2 3 4 5 6 Ha After Before Score Before the Course 84 90 Score After the Course 89 90 94 94 93 78 h 79 87 95 80 85 a. Calculate the value of the test statistic. (Round to two decimal places) b. What is the p-value? (Round to four decimal places) c. At a 5% significance level, the decision is to