Question 14

Question 14 5 pts Directions: Show all your work. Indicate clearly the methods you use, because you will be graded on the correctness of your methods as well as on the accuracy of your results and explanation. A manufacturing company with over 2500 warehouse workers decided to change their warehouse hours from a daily 8 am to 4 pm schedule to a multiple-shift schedule where one group of workers will work mornings (5 am to 1 pm) and another group of workers will work afternoons/evenings (1 pm to 9 pm). In response to worker's complaints about childcare with the new schedule, the manager of the company would like to survey the workers to estimate the proportion of workers who would be interested in a company before/after school childcare center at the warehouse. Two sampling plans for selecting the workers to be surveyed are under consideration by the manager. One plan is to take a simple random sample of the warehouse workers and then survey those workers. The other plan is to take a stratied random sample of the warehouse workers and then survey those workers. A) Describe a simple random sampling procedure that the manager could use to select 200 workers from the 2,500 workers at the warehouse. B) If a stratied random sampling procedure is used, give one example of an effective variable on which to stratify in this survey. Explain your reasoning. C) Describe one statistical advantage of using a stratied random sample over a simple random sample in the context of this study