A confounding variable is an extraneous variable that is related to your independent variable and might affect your dependent variable. In an ideal study, there will be no confounding variables.
For example, student accounts have a limit of $100 limit per day, while non-business accounts usually are limited to $500 withdrawals a day. For business accounts, the bank offers $1000 withdrawals in one day. Chase also offers customers a withdrawal limit of $1000 every 24 hours.
Updated April 4, 2016 6:39 p.m. ET. J.P. Morgan Chase & Co. capped ATM withdrawals at $1,000 per card daily for noncustomersâcracking down as people started pulling out tens of thousands of dollars at a time when the bank was modifying its machines to dispense hundred-dollar bills with no limit.