5. Is the company fulfilling its promise to "change the oil in customers' cars in less than 30 minutes on average?" Unfortunately, Speedy Oil Change continues to get customer complaints. As the manager, you feel that perhaps more analysis is needed. You know that you are likely to be asked "how much less than 30 minutes is our mean oil change?" 6. Construct a 98% confidence interval. Report this confidence interval accurate to 1 decimal place. 7. State the point estimate and calculate the margin of error. 8. Explain to your superiors how to interpret this interval. 9. Using the confidence interval you created, calculate the range of values that answers the question "how much less than 30 minutes is our mean oil change?"