Cohort studies are the highest level of evidence 

_____________ have meaningful intervals between measurements, but there is no true starting point (zero). 

What does it mean if two variables have a positive correlation?

The generalizability of the results to the whole population pertains to what kind of validity?

Causes for scientific misconduct include the following 

The type of reasoning in which one or more specific premises lead to a general conclusion and/or theory. 

When the purpose of the research is to determine the effects of one independent variable in four groups on one dependent variable (e.g., self-concept), the best choice of a statistical analysis is

The characteristics of a subject or participant which an individual “must have” in order to participate in a study is referred to as_______. 

We use non-parametric tests when 

When conducting a literature review, it is recommended to use ________ sources when possible.