A student performs an experiment to determine the local acceleration due to gravity, projects, using a simple pendulum. For several trials, the student measures the length, \(L\), of the string from the pivot to the top of a spherical bob of radius \(R\). The student records the period, \(T\), of the pendulum for small-angle oscillations and plots \(T^2\) on the vertical axis as a function of \(L\) on the horizontal axis. The resulting best-fit line is given by the equation \(T^2 = 4.05L + 0.12\), where \(T\) is in seconds and \(L\) is in meters. Which of the following is a correct interpretation of the data?