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This final questionnaire, with a total of 20 items has good preliminary internal consistency (Cronbach's alpha = 0.94) [ 18].
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They found that the manufactured items have good precision, accuracy and aesthetic appearance.
The item fit statistics for the eight-dimensional model show that all items have good, acceptable fit (mean-square fit statistic between 0.1 and 1.3) for the information-weighted fit and only a few items have unweighted mean-square fit statistics above 1.3.
These items have good reported inter-correlations and reliability [ 38].
Twenty of the items had good discrimination (a > 1.25).
Nine out of 11 items had good or moderate reliability, and two items achieved fair reliability.
Sixteen items had good responses, three items had moderate responses and only two items had poor responses.
For the reliability of items on QAREL, 6 of 11 items had good reliability, and 3 had moderate reliability.
Of the 31 items that were included in the questionnaire, only 22 items had good item to total correlation (>0.4) good inter-item correlation (0.4 0.7).
Alpha coefficients could not be improved by the exclusion of any item, and all 12 items had good convergent validity (item scale correlation ≥ .40).40
Individual items had good Pearson correlation coefficients with lower for item No 6 (R = 0.51) and higher for item No 7 (R = 0.89).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com