The managers of a brokerage firm are interested in finding out if the number of new clients a broker brings into the firm affects the sales generated by the broker. They sample 32 brokers and determine the number of new clients (X) they have enrolled in the last year and their sales amounts in thousands of dollars (Y). These data are partially presented in the table with the following results: SST=1564.2, SSR=1227.4, and the linear regression equation is Y= 17.7 + 1.12X. What is the value of s_e for this regression model?