How Many Data Points and How Large an R-Squared Value is Essential for Arrhenius Plots?

•Arrhenius plots with three or four data points underestimate the error of Ea.•Minimum five data points are essential to avoid underestimating the error of Ea.•R2 values alone do not give information on the error of Ea.•A graphic correlation between Ea ± ΔE and the R2 value was constructed for easy use.•The R2 together with the number of data points enables the statistical analysis of Ea.