Assignment:
A person's critical flicker frequency is the highest frequency at which he or she can detect that a light source is flickering. Above the critical flicker frequency, the light source appears to be continuous despite the fact that it is flickering. To determine critical flicker frequency, a random sample of 19 young adult males with either blue, green, or brown eyes were asked to identify whether a light source was flickering or not at various frequencies (measured in hz). The data appear in the file eyeflicker.sav.
(a) Is there evidence that different eye colour groups for young adult males (blue, green, and brown) have different average critical flicker frequencies? Be sure to state the null and alternative hypotheses, the observed test statistic, the null distribution, the p-value, and an appropriate conclusion in plain language.
(b) If appropriate, identify which eye colour groups have significantly different mean critical flicker frequencies, with reference to appropriate SPSS output. If post-hoc tests are not appropriate, explain the purpose of a post-hoc test and why it is not appropriate in this example.
(c) What are the assumptions of your analysis in part (a)? Are these assumptions met? Justify why or why not for each assumption.