Statistical Methods for Data Science Mini Project 2

Statistical Methods for Data Science
Mini Project 2
Instructions:
• Total points = 20.
• Submit a typed report.
• Justify all steps and provide all relevant explanations.

• Do a good job.
• You must use the following template for your report:
Mini Project #
Name
Names of group members (if applicable)
Contribution of each group member
Section 1. Answers to the specific questions asked
Section 2: R code. Your code must be annotated. No points may be given if a brief
look at the code does not tell us what it is doing.
1. (12 points) Consider the dataset roadrace.csv posted on eLearning. It contains
observations on 5875 runners who finished the 2010 Beach to Beacon 10K Road Race
in Cape Elizabeth, Maine. You can read the dataset in R using read.csv function.
(a) Create a bar graph of the variable Maine, which identifies whether a runner is
from Maine or from somewhere else (stated using Maine and Away). You can
use barplot function for this. What can we conclude from the plot? Back up
your conclusions with relevant summary statistics.
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(b) Create two histograms the runners’ times (given in minutes) — one for the
Maine group and the second for the Away group. Make sure that the histograms
on the same scale. What can we conclude about the two distributions? Back
up your conclusions with relevant summary statistics, including mean, standard
deviation, range, median, and interquartile range.
(c) Repeat (b) but with side-by-side boxplots.
(d) Create side-by-side boxplots for the runners’ ages (given in years) for male and
female runners. What can we conclude about the two distributions? Back up
your conclusions with relevant summary statistics, including mean, standard
deviation, range, median, and interquartile range.
2. (8 points) Consider the dataset motorcycle.csv posted on eLearning. It contains
the number of fatal motorcycle accidents that occurred in each county of South Carolina during 2009. Create a boxplot of data and provide relevant summary statistics.
Discuss the features of the data distribution. Identify which counties may be considered outliers. Why might these counties have the highest numbers of motorcycle
fatalities in South Carolina?
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