Contents

Practice Questions

  1. Using the data set Active.txt:
    • Read the data into R.
    • What is the minimum score of mmse? What is its average? Standard deviation?
    • How many males and females in each training group?
    • How many participants completed high school (at least 12 years of education)?
    • What is the percentage of missing data in the variable ufov?
  2. Using the data set Active.txt. select two variables and make a scatterplot.
  3. The figure below shows the number of subscriptions of two papers per year. Plot the data using the line plot in one plot. Compare your graphs with the one below and describe the differences.

To cite the book, use: Zhang, Z. & Wang, L. (2017-2025). Advanced statistics using R. Granger, IN: ISDSA Press. https://doi.org/10.35566/advstats. ISBN: 978-1-946728-01-2.
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