An analyst engaged in the tourism industry obtained detailed information on 76 travel packages offered by a Viennese travel agency. The file Travel contains the following variables:

a. Develop a regression model to predict travel price based on distance.

b. Develop a regression model to predict travel price based on mark.

c. Develop a regression model to predict travel price based on distance and mark.

d. Compute and interpret the adjusted r²  for each of the three models.

e. Which of the three models do you think is the best predictor of price?

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- Price (price of the package for one person, in ) - Distance (distance between departure and destination settlement, in kilometres) - Mark (mean of former travelers' evaluation of the hotel, based on a scale of 0 to 10)