Prenumbered sales invoices are kept in a sales journal. The invoices are numbered from 0001 to 5000.
a. Beginning in row 16, column 01, and proceeding horizontally in Table E.1, select a simple random sample of 50 invoice numbers.
b. Select a systematic sample of 50 invoice numbers. Use the random numbers in row 20, columns 05-07, as the starting point for your selection.
c. Are the invoices selected in (a) the same as those selected in (b)? Why or why not?