Comparison of Automatic vs. Manual Transmission on Auto Miles Per Gallon

Jill Beck
April 9 2016

Overview

The analysis will explore the relationship between a set of variables on Miles Per Gallon (MPG). The analysis will focus on the following questions:

  • Which kind of transmission is better for MPG: manual or automatic?
  • Quantifying the difference in MPG between manual and automatic transmissions.

Data Exploration

From the plot, we can see some higher correlations between variables such as:

  • “hp”
  • “wt”
  • “am”

plot of chunk unnamed-chunk-1

Regression Analysis and Prediction

The regression model will predict MPG based on transmission type, weight and horsepower.

Linear regression model:

fit <- lm(mpg ~ am + wt + hp, data = mtcars)

Coefficient:

Estimate Std. Error t value Pr(>|t|)
(Intercept) 34.0028751 2.6426593 12.866916 0.0000000
amManual 2.0837101 1.3764202 1.513862 0.1412682
wt -2.8785754 0.9049705 -3.180850 0.0035740
hp -0.0374787 0.0096054 -3.901830 0.0005464

Application Details

Shiny App Screenshot Shiny App

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