• Selection of Statements in Thurstone's Equal-Appearing Intervals:
• In L.L. Thurstone's method of scale construction:
• Each statement is assigned a Scale Value ($S$, median rating of judges) and an Interquartile Range ($Q = Q_3 - Q_1$).
• The $Q$ value represents ambiguity: A large $Q$ indicates wide disagreement among judges (ambiguous item), whereas a small $Q$ indicates high judge agreement (unambiguous item).
• Statements best suited for inclusion in the final attitude scale are those with the smallest $Q$ values distributed evenly across the scale continuum.
• Among the given options, $S = 4.23, Q = 1.95$ has the lowest $Q$ value ($1.95$), representing the least ambiguous and most reliable statement.

Correct option: (4) S = 4.23, Q = 1.95

• Attitude Scoring in Paired Comparison Technique:
• In Thurstone's method of paired comparisons, each attitude item has an empirically determined scale value along the psychological continuum.
• respondent's overall attitude score is computed as the median or arithmetic mean of the scale values of all statements with which the respondent agrees.
• Statements agreed with: Statement 2 ($4.5$), Statement 3 ($5.5$), and Statement 4 ($6.5$).

• Thus, the subject's attitude score is $5.5$, corresponding to Option 2.

Correct option: (2) 55