QUESTION $13$

What have researchers seen as evidence that employee performance is influenced by something other than the physical work conditions?

Managers who told their subordinates they were under observation received more complaints than other managers.

Employees who knew they were being observed called in sick more often than employees who did not know they were being observed.

Employees who believed they were under observation performed the same as employees who did not believe they were under observation.

Any change in a variable, such as lighting levels, led to an improvement in productivity; this was true even when the change was negative, such as a return to poor lighting.