4. Using the confidence interval you created in #1, answer the question "How much less than 30 minutes is our mean oil change?" by filling in the blanks below. (1 decimal place) Show your work. We are 98 % confident that our mean oil change takes to minutes less than 30 minutes. 5. Construct a boxplot for how many minutes more or less than 30 minutes for an oil change for the 36 data values that you randomly audited. Draw the plot on the following scale and label the important values (i.e. the 5-number summary). [Hint: Find the difference between each wait time and 30 minutes to obtain your new data values for the boxplot.]