Question: 15: Create a linear model predicting actual AP exam score based on the student's PSAT score, using the `apdata_clean` dataset. Store the model as `mod1`in

15: Create a linear model predicting actual AP exam score based on the student's PSAT score, using the `apdata_clean` dataset. Store the model as `mod1`in Rstudio and data set named "apdata

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