Finally, Lisa had accessed the data files with the daily summaries of teller cash transactions.
From the more than three years worth of daily data, she had done some simple statistical analysis , consisting mostly of computing the average number of cash transactions per day.
She had calculated the average for each month , for each day of the week, and for each date of the month.
Since they would distort the normal patterns, she left the days before and after houlidays out of the calculations.
She printed a summary for herself so she could see what the results looked like (see Table 3).