Traffic congestion decreases vehicle speed and increases travel time. Use the sample data below to test the claim that mean vehicle speed is less than 60 mph. = 56 mph s = 12 mph n = 43 1. Write the null and alternative hypothesis 2. Which hypothesis is the initial claim? 3. Calculate the critical value for a level of significance of a = 0.05. Remember to use invT on your Ti-84 4. Plot the critical value and shade the rejection region t-axis 5. Calculate the test statistic 6. Plot the test statistic relative to the rejection region 7. Did the test statistic fall in the rejection region? 8. Will the null hypothesis be rejected? 9. Correctly state the outcome 10. Was the initial claim upheld