STA-290 HW 1

From the IMS Textbook, do the following exercises:

• Ch 4.8: #4, #5, #6
• Ch 5.10 #1, #2

Question 1: For this question, we will use data obtained from the US Department of Education’s College Scorecard which includes information from 2019 on all primarily undergraduate colleges with at least 400 enrolled students.

The link for the data is available at this URL: https://remiller1450.github.io/data/Colleges2019_Complete.csv

• Part A Write code to load this data into R as a data.frame named colleges
• Part B Find the number of observations and variables in this dataset. In one sentence, briefly describe what constitutes an observation in this data
• Part C Below we see a plot showing the relationship between Cost, a school’s total annual cost of attendance without considering financial aid, and Salary10yr_median, the median salary of graduates from the college 10 years after receiving their degree. Use the plot to answer the questions the following questions
  • What type of plot is displayed here?
  • Comment on the form, strength, and direction of the relationship. What do we see? (approximate answers are OK)

• Part D Consider this plot again, now with color added to the plot. What kind of variable is represented by the color (categorical/quantitative), and how does adding color change our interpretation of the plot?