A Marketing Researcher Subcontracts the Data Collection Process to a Field

A marketing researcher subcontracts the data collection process to a field services firm.After the data is collected,the researcher is editing the questionnaires,and finds a large number of mistakes.In many cases skip patterns were not followed,and difficult questions were often skipped.The researcher contacts several of the persons that did the interviewing and finds that they received little,and in some cases,no training or supervision.What kind of error is evident here?

A) processing error
B) interviewer error (bias)
C) surrogate information error
D) measurement instrument bias
E) sampling error

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