Zagat's publishes restaurant ratings for various locations in the US. The file Restaurant contains the Zagat rating for good, dcor, service, and the cost per person for a sample of 100 restaurants located in New York City and in a suburb of New York City.

1. Construct a scatter plot
2. Compute the regression coefficients and interpret the meaning.
3. Develop a regression model to predict the cost per person, based on a variable that represents the sum of the ratings for food, dcor, and service.
4. Predict the mean cost per person for a restaurant with a summated rating of 50.