Validating test items with spss

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Therefore, we would not want to remove these questions.Removal of question 8 would lead to a small improvement in Cronbach's alpha, and we can also see that the "Corrected Item-Total Correlation" value was low (0.128) for this item.In SPSS Statistics, the nine questions have been labelled .To know how to correctly enter your data into SPSS Statistics in order to run a Cronbach's alpha test, see our Entering Data into SPSS Statistics tutorial.

In order to do this and then check their reliability (using Cronbach's alpha), you will first need to run a test such as a principal components analysis (PCA).

Furthermore, you may find it useful to think of validity as a property of the application of a test to the formation of a conclusion, rather than being a property of the test per se.

Thus, you may want to reframe your question as one of saying whether the conclusions you want to make from the test are valid. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

The Item-Total Statistics table presents the "Cronbach's Alpha if Item Deleted" in the final column, as shown below: This column presents the value that Cronbach's alpha would be if that particular item was deleted from the scale.

We can see that removal of any question, except question 8, would result in a lower Cronbach's alpha.

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