Refer to the auto.rds dataset and variable description slide discussed in class. In addition to other variables, the dataset contains price, mpg, weight, length, and foreign (foreign vs. domestic) for 74 cars. Suppose the variables listed above are the only determinants of an auto price. Moreover, it is believed that the effect of mpg on price is different between domestic and foreign cars.

Using the "Studentized Residual" plot, identify the outliers in the data set. How many observations are outliers?

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