Cronbach's Alpha Refers To

Cronbach's alpha refers to:

A) the degree to which individual measurements of a variable differ from one another.
B) a statistic used to indicate how much, on average, an individual score differs from the arithmetic mean of the scores.
C) a statistic used to evaluate the internal consistency reliability of a scale.
D) the conclusion a researcher makes when the probability is that one's hypothesis is unlikely to be incorrect given the data collected.