In five-factor model of personality, neuroticism measures how easy a person experience negative feeling that increase their overall stress level. People that are high in neuriticsm tend to be seen as 'unfavorable' for leadership positions since their emotion will become a hindrance in their critical thinking process.
The case of the extraneous variable is most likely to be determined by the student grade level that is level of the education program that is for the grade level. This refers to all the course level and can be use to trace out the external variable that are not intentionally studied in the test or experiment and tends to affect the other variables.
