(2 marks) Using the mean RT data for visual, auditory, visual+auditory stimuli in Lab 1, calculate the correlation coefficients for the RT between all three pairs of stimuli using Excel (1.5 marks). This should use the mean RTS for three conditions for your entire lab (so a N of at least 15 participants, that your TA will provide). What is the critical value necessary to determine if each of the correlation coefficient is significant (0.5 mark).