Example - Iris
http://tutor-web.net/stats/stats5462oanova/lecture10/iris.PNGIs there a difference in petal length and width between iris species?
Explanation
\textbf{Output from R}
\begin{verbatim}
Df Sum Sq Mean Sq F value Pr(>F)
Species 2 437.1 218.55 1180 <2e-16 ***
Residuals 147 27.2 0.19
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
\end{verbatim}
\begin{verbatim}
Df Sum Sq Mean Sq F value Pr(>F)
Species 2 437.1 218.55 1180 <2e-16 ***
Residuals 147 27.2 0.19
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
\end{verbatim}
Details
In the dataset Iris are measurment of sepal and petal lenght and sepal and petal width of three iris species, setosa, versicolor and virginica.\\
\\
A research question is: Is there a difference in petal length and width between the specis.\\
In this example the species is a factor which has three levels.
\\
A research question is: Is there a difference in petal length and width between the specis.\\
In this example the species is a factor which has three levels.