A computer technology firm wishes to check whether the speed of a new processor exceeds that of an existing processor when used in one of its popular laptop computer models. Accordingly, it measures the time required (in seconds) to complete seven common tasks on two otherwise identical computers, one with the new processor and one with the existing processor. The firm calculates the following summary statistics for the sample difference: mean sample difference in time required (between new processor and existing processor) = -0.2771 and the standard deviation of sample difference = 0.1991. Assuming the difference in time is normally distributed, calculate the value of the test statistic (round your final answer to two decimal places).