What are the four principles of Experimental Designs? Explain. Analyze the following design. Is this a simple survey, an observational study or an experiment? What'are the populations, the parameters of interest, and the sample procedure. If an observational study, was it retrospective or prospective? If an experiment, describe the factors, treatments, and any blocking, matching, or blinding. A soft drink company must be sure the bottle caps on the soda are fully sealed and will not come off easily. Inspectors pull a few bottles of the productions line at regular intervals and test the cap. If they detect any problem, they will stop the bottling process to adjust or repair the machine that caps the bottles. \\