Overall, professor salaries barely budged during past year, the Chronicle says, noting that on average, salaries for full-time faculty rose 1.8% in the 2011-12 school year, while inflation was 3%. Tuition, meanwhile, has increased dramatically.
Inferential Statistics. Inferential statistics is concerned with making predictions or inferences about a population from observations and analyses of a sample. That is, we can take the results of an analysis using a sample and can generalize it to the larger population that the sample represents.
Predictive (or inferential) statistics demand larger samples and higher response rates than do descriptive statistics. The sample must be representative of the targeted population about whom you want to make inferences. And your survey needs to demonstrate adequate validity, reliability, and internal consistency.