are studying the effects of type of stimulus (visual or auditory) AND speed of presentation (fast or slow) on memory, then finding one significant main effect means that the effect of type of stimulus or speed of presentation is significant. the effects of both type of stimulus and speed of presentation are significant. there is a significant interaction between type of stimulus and speed of presentation. the effects of neither type of stimulus nor speed of presentation are significant. In an A BAB design, O you take baseline measurements of behavior, then introduce a treatment and measure behavior, then remove the treatment and measure behavior, and then reintroduce the treatment and measure behavior you have two subjects, A and B, and A gets a treatmént and B does not and then B is given the treatment and Ais not. you compare the effects of treatment A and treatment B you need to have a large (> 30) number of participants.

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Bar Graphs

A bar graph is a chart or graphical representation of data. A bar chart, also known as a bar graph, is a graph or chart that displays categorical data using rectangular bars with heights or lengths equal to the values they represent. Typically, bar graphs show categorical and numerical variables grouped in class intervals. A bar graph is useful for comparing and analyzing a set of data.