Reaction Time In an online psychology experiment sponsored by the University of Mississippi, researchers asked study participants to respond to various stimuli. Participants were randomly assigned to one of three treatment groups: Group 1, the simple group, required to respond as quickly as possible after a stimulus was presented; Group 2, the go/ no-go group, required to respond to a particular stimulus while disregarding other stimuli; and Group 3, the choice group, required to respond differently depending on the stimuli presented. The researcher felt that age may be a factor in determining reaction time, so she organized the experimental units by age and obtained the following data:

(a) What type of factorial design is this? How many replications are there within each cell?

(b) Normal probability plots indicate that it is reasonable to believe that the data come from populations that are normally distributed. Verify the requirement of equal population variances.

(c) Determine if there is significant interaction between stimulus and age.

(d) If there is no significant interaction, determine whether there is significant difference in the means for the three types of stimulus. If there is no significant interaction, determine whether there is significant difference in the means for the three categories of age.

(e) The residuals are normally distributed. Verify this.

(f) Draw an interaction plot of the data to support the results of parts (c) and (d).

This exercise is excellent for doing together as a class and will help in evaluating your university’s major strengths and weaknesses. An organization’s strategies are largely based on striving to take advantage of strengths and improving on weaknesses. Instructions Step 1 As a class, determine your college or university’s major internal strengths and weaknesses. List 10 strengths and 10 weaknesses. Step 2 Get everyone in class to rank their factors with 1 being most important and 10 being least important. Step 3 Gather up everyone’s papers, count the numbers, and in that manner create a prioritized list of the key internal strengths and weaknesses facing your college.