Roy’s toys received a shipment of rubber duckies from the factory. the factory couldn’t promise that all rubber duckies are in perfect form, but they promised that the percentage of defective toys won’t exceed . roy wanted to get an estimation of the percentage of defective toys, and since he couldn’t go over the entire duckies, he took a random sample of duckies. he found that of them were defective. what type of statistical study did roy use?
(choice a) sample study a sample study
(choice b) experiment b experiment
(choice c) observational study c observational study