An article in Industrial Quality Control (1956, pp. 5–8) describes an experiment to investigate the effect of two factors (glass type and phosphor type) on the brightness of a television tube. The response variable measured is the current (in microamps) necessary to obtain a specified brightness level. The data are shown in the following table:
(a) State the hypotheses of interest in this experiment.
(b) Test the hypotheses in part (a) and draw conclusions using the analysis of variance with α = 0.05.
(c) Analyze the residuals from this experiment.
Week 2: 8/299/4 Experimental Psychology Experimental s. NonExperimental Research External Validity ● The degree to which research findings can be generalized to other settings and individuals ● Nonexperimental studies have higher external validity Case Studies ● Descriptive study of a subject’s experiences, behaviors, and records ● Pros: source of hypotheses and theories, source of therapy techniques, and allows study of rare phenomena ● Cons: limits representativeness of sample, completeness of data, and reliance on retrospective data Retros
