Definition of cronbach's alpha
According to Fattah (2008), reliability can be measured using statistical packages such as SPSS by measuring the reliability coefficient (also known as Cronbach's Alpha). Cronbach’s Alpha takes a value ranging between (0 – 1). The higher the value, the more reliable are the instrument and the questions used in the questionnaire.References
Fattah, E.A. (2008). An introduction for descriptive and inferential statistics using SPSS. 1st Ed. [Online]. Jeddah, KSA: Khawarezm library. Available from: https://stat.utexas.edu/images/SSC/documents/SoftwareTutorials/SPSS_DescriptiveInferential.pdf.