ABSTRACT

The previous chapters have addressed several issues about samples, means, and standard errors, with the intent to explain the data. It has been pointed out that all differ and that depending on the sample you may get different answers. This chapter will explore these differences based on two dependent means because the real issue is, how much do they differ? How can you decide whether a difference in sample means can be attributed to their natural variability or to a real difference between groups in the population? And what is significant?