Mutually Exclusive – the first measure ensures that each individual answer given in a single or multiple response survey question cannot be true at the same time. Survey writers need to double-check their listed responses so that each answer is exclusive to another. This is a common mistake among inexperienced survey writers (and even experienced ones).
https://rmsbunkerblog.wordpress.com/2010/04/27/mutually-excl...


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Note added at 5 hrs (2014-12-18 22:43:46 GMT)
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Mutually Exclusive

Allyson Holbrook

Response options to a survey question are mutually exclusive when only one response option can be true for a single respondent. Consider a survey question that asks respondents, How long do you spend commuting each day (round trip): less than 15 minutes, 15 to 30 minutes, 30 minutes to one hour, or one hour or longer? A respondent who commutes for 30 minutes each day could choose either the second or the third response option, so the options are not mutually exclusive. Because response options overlap, a researcher examining responses to this question cannot differentiate between respondents. http://srmo.sagepub.com/view/encyclopedia-of-survey-research...