In the manual for an attitude scale, Item 14 is listed as having a scale value of 5.7 and Item 15 has a scale value of 7.4. It sounds as if this attitude scale has been developed with what method?

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The mention of specific scale values for items suggests the Thurstone method, which involves assigning numerical values to statements to represent their position on an attitude continuum. This method is known for its use of a panel of judges to rate items, resulting in scale values that indicate the intensity of the attitude being measured.

In the Manual for an Attitude Scale, Item 14 Is