determine what percentage of its inventory is defective? Estimate to within .01 with 90% confidence. 10. According to the Bureau of Labor Statistics, people who work in jewelry stores have a probability of less than 1% of being injured on the job. You take a random sample of 200 jewelry store employees and find that 3 had been injured on the job. Estimate the true proportion of jewelry store workers who were injured on the job using a 95% confidence interval.