A large number of workers have resigned quit or changed jobs during the pandemic. A local newspaper reporter wants to know what proportion of workers left their job because of children difficulties. He is designing a survey and needs to determine the number of people to include in his sample. a. Without any preliminary information, what is the minimum number of people the reporter should include his sample in order to have a level of confidence of 95% and a margin of error of 4 percentage points? b. The reporter continues researching previous studies on this topic and finds an article that indicates that 27% of workers in another city left the workforce due to childcare difficulties. Using this proportion as a preliminary estimate, what is the minimum sample size needed to have a level of confidence of 95% and a margin of error of 4 percentage points