The effect of polluted data and random data on questionnaires’ reliability intermediary

When a researcher collects a questionnaire data, as the first step, Cronbach'sα (alpha) is being calculated. Its enlargement results in a license for entering a variable to the research and then investigating its links to other variables. In this research, Cronbach's α (alpha) is calculated in a situation where two and three variables (two and three questions). Mixed data consists of individuals whom are in another and similar group. But random data don't have any order. Results show that the effect of mixed data on Cronbach'sα (alpha) reduction is more than random data.