Operations management

Nathan created a questionnaire that will be identifying the satisfaction level on the outreach services of his company. In creating the questionnaire, he considered years in service as a moderator. The respondents have to put a check mark on number $1-5.$ The number of years were presented per five years. For some respondents, they did not put a mark.

what type of scale has been the issue of not answering by some respondents?

NOMINAL SCALE

ORDINAL SCALE

INTERVAL SCALE

RATIO SCALE