$$

P$7-19.$ Identify one or more control procedures $($either general or application controls, or both$)$ that would guard against each of the following errors or problems.

$1.$ A bank deposit transaction was accidentally coded with a withdrawal code.

$2.$ The key$-$entry operator keyed in the purchase order number as a nine$-$digit number instead of an eight$-$digit number.

$3.$ The date of a customer payment was keyed $2001$ instead of $2015.$

$4.$ A company employee was issued a check in the amount of $$135\mathrm{.}65$ because he had not worked a certain week, but most of his payroll deductions were automatic each week.

$5.$ A patient filled out her medical insurance number as $123465$ instead of $123456.$

$6.$ An applicant for the company stock option plan filled out her employee number as $84-7634-21.$ The first two digits are a department code. There is no department $84.$

$7.$ A high school student was able to log onto the telephone company$$s computer as soon as he learned what telephone number to call.

$8.$ The accounts$-$receivable department sent $87$ checks to the computer center for processing. No one realized that one check was dropped along the way and that the computer therefore processed only $86$ checks.