A First Course in Quality Engineering, 2nd Edition

148 A First Course in Quality Engineering

two sets of responses� A high correlation between the two sets of responses

will indicate high reliability of the questionnaire� Another way of evaluating

this reliability is to include in the questionnaire two questions for each attri-

bute, worded differently� The correlation between the responses for the same

attribute is then evaluated� A high correlation would indicate high reliability

of the questionnaire� The example questionnaire from the bank in Table 3�2

contains questions of this kind�

A survey result becomes more reliable with improvements in the clarity

and relevance of the questions� It ...