A published study reports that the results of an extensive study of men and women comparing the number of words uttered per day by each sex. Volunteer participants wore inconspicuous recording devices that recorded their daily word usage. On average, women (N= 198) uttered 16201 words per day (SD= 1779.45), and men uttered 15993 words per day (SD= 2224.61). If you were to build a confidence interval using the data provided to estimate the gender difference of the number of words uttered per day, the confidence interval would be centered around __________.