Scenario: Go back to the full Pipeline Safety data table. Clear row states to show and include all states and years. We will compare the age of pipelines in locations controlled by the operator and those that are public rights of way.

a. Use the Distribution platform to inspect the distributions of YRS_IN_PLACE by LOCATION_TYPE. Write a sentence comparing the two distributions. Does your inspection of the distributions give the impression that they are similar or different?

b. Estimate the difference in years in place for lines on Operator-Controlled Property versus Pipeline Right-of-Way. Assume for the moment that utility companies can more easily perform maintenance on property that they control. Interpret your findings in light of this assumption.

c. Test the hypothesis that the variances are equal in comparing pipeline for leaks versus ruptures. Explain your conclusion.