Elena conducted an investigation to see if completing a brief placement in a psychiatric clinic affected undergraduate psychology students' interest in pursuing a career in clinical psychology.

She used two groups of undergraduate psychology students from a university as her participants:

• Condition A: 25 students who completed a 4-week placement in a psychiatric clinic.
• Condition B: 25 students who did not complete a placement in a psychiatric clinic.

She gave each of her participants a questionnaire asking them whether they intended to pursue a career in clinical psychology. The participants had to circle 'yes' or 'no'.

State a fully operationalised non-directional (two-tailed) hypothesis for Elena's investigation.