Based on the following output, which item of the questionnaire would improve the reliability of the scale most if it was removed?

 
R E L I A B I L I T Y   A N A L Y S I S   -   S C A L E   (A L P H A)
 
 
Item-total Statistics
 
               Scale          Scale      Corrected

               Mean         Variance       Item-            Alpha
              if Item        if Item       Total           if Item
              Deleted        Deleted    Correlation        Deleted
 
Q1            54.1282       166.2200        .5505           .9082
Q2            54.5641       165.0418        .4917           .9092
Q3            56.0256       159.4467        .5719           .9072
Q4            54.6667       158.5439        .6972           .9039
Q5            55.0769       159.9676        .6225           .9058
Q6            54.9744       158.3414        .6422           .9052
Q7            54.6667       160.1228        .6374           .9055
Q8            54.5385       159.9393        .6314           .9056
Q9            55.1538       152.5020        .6596           .9048
Q10           55.6154       160.0850        .5321           .9084
Q12           56.0256       170.8151        .2423           .9156
Q14           54.3846       164.1377        .5508           .9078
Q16           54.9487       163.4710        .4447           .9108
Q17           55.0769       155.3887        .6760           .9041
Q18           55.5897       157.1430        .6421           .9051
Q19           56.0513       165.3131        .5756           .9076
Q20           55.0769       163.0729        .4870           .9095
Q21           55.1026       152.9892        .7586           .9015
 
 
 
Reliability Coefficients
 
N of Cases =     39.0                    N of Items = 18
 
Alpha =    .9118

A. Q12
B. Q16
C. Q21
D. Q4


Answer: A

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