Airlines have increasingly outsourced the maintenance of their planes to other c

Question

Airlines have increasingly outsourced the maintenance of their planes to other companies. Critics say that the maintenance may be less carefully done, so that outsourcing creates a safety hazard. As evidence, they point to government data on percent of major maintenance outsourced and percent of flight delays blamed on the airline (often due to maintenance problems). (Data set may be found here.)

(b) Find the correlation r with and without Hawaiian Airlines. (Round your answers to three decimal places.)

(c) Find the least-squares lines for predicting delay percent from outsourcing percent with and without Hawaiian Airlines. (Enter your intercepts to two decimal places, and your slopes to five decimal places.)

Use the line from above that includes Hawaiian Airlines to predict the percent of delays blamed on an airline that has outsourced 79.1% of its major maintenance. (Round your answer to two decimal places.)
%

Give the predicted percent with Hawaiian Airlines removed. (Round your answer to two decimal places.)
%

with Hawaiian Airlines      r = without Hawaiian Airlines      r = Outsource Delay Outsource Delay Airline Alaska American Delta Frontier Hawaiian Percent 52.1 25.7 41.3 Percent 19.60 19.58 23.17 10.80 PercentAirline 10.51 JetBlue 20.41 Southwest 12.46 United 19.80US Airways 4.85 Percent 66.3 60.8 47.3 56.5 79.1

Explanation / Answer

(b) Here are the correlation factor with hawaiian airlines r = -0.4882 [ with help of CORREAL function of excel ]

Correlation factor without hawaiian airlines r = - 0.2413

(c) WIth Hawaiian AIrlines y^ = 21.8151 - 0.1285x

Without Hawaaian airlines y^ = 19.4602 - 0.0553x

Here with Hawaiian AIrlines R2  = 0.0582

Without Hawaiian AIrlines R2  = 0.2384

Use the line from above that includes Hawaiian Airlines to predict the percent of delays blamed on an airline that has outsourced 79.1% of its major maintenance. (Round your answer to two decimal places.)
23.84 %

Give the predicted percent with Hawaiian Airlines removed. (Round your answer to two decimal places.)
5.82%

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