Quarterly Enrollments in Business Statistics Class for Three Years Are

Essay

Quarterly enrollments in business statistics class for three years are shown in the table below.Compute the four-quarter centered moving averages.
$$\begin{array} { | c | c c | } \hline \text { Year } & \text { Quarter } & \text { Enrollment } \\\hline 2011 & 1 & 26 \\& 2 & 29 \\& 3 & 33 \\& 4 & 18 \\\hline 2012 & 1 & 27 \\& 2 & 25 \\& 3 & 36 \\& 4 & 21 \\\hline 2013 & 1 & 32 \\& 2 & 36 \\& 3 & 39 \\& 4 & 30 \\\hline\end{array}$$